Microsoft's October Windows Server updates may disrupt Exchange email. Here's what administrators need to know about the temporary workaround.

The post Microsoft Warns Windows Server Updates May Disrupt Exchange Email — Here’s the Workaround appeared first on TechRepublic.

Microsoft links Exchange Server instability to October 2026 Windows updates. See the OWA and mail queue symptoms, plus the registry fix.

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The post Exchange Server Instability Tied to October Windows Updates appeared first on Daily CyberSecurity.

Microsoft Patch Tuesday security updates for October 2026 address a record 1,415 vulnerabilities. Prioritize the exploited zero-day, critical bugs and potentially wormable vulnerabilities.

Microsoft just shattered every patch record in the book. October 2026 brought us a staggering 1,415 new CVEs from Microsoft alone.

“Well, it’s a new record release from Microsoft, again. This is also the first four-digit volume we have ever seen and includes six-digit CVEs. As always, counting this load is tricky, but I see 1,415 new CVEs from Microsoft. That puts this month at a greater volume than any previous YEAR from Microsoft. I’m starting to think I don’t like this new normal.” states ZDI. “As for the products affected by this release, we have Windows and Windows components, Office and Office Components, Developer Tools and .NET, SharePoint, Linux kernel, Skype for Business and Microsoft Lync, SQL Server and Dynamics, Azure and cloud services, and Exchange server.”

This is the first time Microsoft has reported more than 1,000 vulnerabilities in a single month. To help security teams handle this huge number of flaws, Microsoft introduced “risk cohorts” to group related vulnerabilities, similar to the old security bulletin system. AI is clearly helping researchers find bugs faster, both for attackers and defenders. The good news is that vulnerabilities are still being discovered faster than attackers are exploiting them. Security teams should focus on the most serious threats first instead of trying to patch every low-risk flaw at once.

Instead, focus immediately on what’s actively burning in the wild. The single zero-day under active attack this month is CVE-2026-96951, a Windows Shell security feature bypass used to dodge Mark of the Web protections.

“An attacker who successfully exploited the vulnerability could evade Mark of the Web (MOTW) defenses.” reads the advisory. “In an email or instant message attack scenario, the attacker could send the targeted user a specially crafted file that is designed to exploit the vulnerability. In any case an attacker would have no way to force a user to view attacker-controlled content. Instead, an attacker would have to convince a user to take action. For example, an attacker could entice a user to either click a link that directs the user to the attacker’s site or send a malicious attachment.”

Other high-priority threats include a critical unauthenticated SharePoint privilege escalation bug (CVE-2026-102866), a high-scoring SQL Server remote code execution flaw (CVE-2026-65674), and a massive wave of 59 potentially wormable vulnerabilities spanning core network services like DHCP, Remote Desktop Gateway, and DNS.

Below are the descriptions for the above issues:

• CVE-2026-96951 (CVSS score of 8.8) is a Windows Shell command injection vulnerability that allows an unauthorized attacker to bypass security protections over a network. Exploitation can evade Mark of the Web (MOTW) defenses, which help protect users from potentially dangerous files downloaded from the internet. Microsoft confirmed that the flaw is being actively exploited.
• CVE-2026-102866 (CVSS score of 8.1) is a Microsoft SharePoint Server vulnerability caused by improper verification of cryptographic signatures. It allows an unauthenticated attacker to elevate privileges over a network, potentially gaining unauthorized access to sensitive information or modifying data.
• CVE-2026-65674 (CVSS score of 8.8) is a Microsoft SQL Server remote code execution vulnerability caused by the deserialization of untrusted data. An authorized attacker with the required privileges could exploit the flaw over a network to execute code on the affected server.

“I may be wrong about some of these – there are a few where the description is somewhat…er…ambiguous, but regardless, this number of wormable bugs in 2026 should cause some level of concern. Not panic.” concludes ZDI. “There’s no need for that, but it is disconcerting to see this many juicy targets sitting out there. Please do your best to test and deploy these fixes in a timely manner.”

Prioritize the proven, public, and exploited flaws first, and take a deep breath before diving into the rest of the patch mountain. Make sure your operational priorities remain laser-focused on real risk rather than chasing vanity metrics.

Make every effort to test and apply these patches as soon as possible.

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Patch Tuesday)

Microsoft's October 2026 Patch Tuesday fixes 1,413 vulnerabilities, including an exploited Windows zero-day and critical Outlook security flaws.

The post Microsoft Patch Tuesday Fixes 1,413 Flaws: Windows Zero-Day Already Under Attack appeared first on TechRepublic.

Microsoft has released its monthly security update for October 2026, which includes 1415 vulnerabilities affecting a range of products, including 85 that Microsoft marked as "critical."

Microsoft notes that 1 of the vulnerabilities disclosed this month have been exploited in the wild

CVE-2026-96951 is a security feature bypass vulnerability that affects Windows Shell. The shared weakness is Improper Neutralization of Special Elements used in a Command ('Command Injection'). The vulnerability has a CVSS base score of 8.8.

Out of 85 "critical" vulnerabilities, 67 are remote code execution (RCE) vulnerabilities.

Microsoft considers exploitation of the following vulnerabilities more likely.

CVE-2026-70229 is a remote code execution vulnerability that affects Windows Active Directory Domain Services. The shared weakness is Incorrect Authorization. The vulnerability has a CVSS base score of 8.1.

CVE-2026-70571 is a remote code execution vulnerability that affects Microsoft Exchange Server. The shared weakness is Stack-based Buffer Overflow. The vulnerability has a CVSS base score of 8.1.

Microsoft considers exploitation of the following vulnerabilities less likely.

CVE-2026-105733, CVE-2026-102214, and CVE-2026-108399 affect Windows Hyper-V. CVE-2026-105733 has an impact of remote code execution; involves Incorrect Initialization of Resource; has a CVSS base score of 8.8. CVE-2026-102214 has an impact of remote code execution; involves Use After Free; has a CVSS base score of 8.8. CVE-2026-108399 has an impact of elevation of privilege; involves Heap-based Buffer Overflow; has a CVSS base score of 7.2.

CVE-2026-100202 is a remote code execution vulnerability that affects Windows Message Queuing Queue Manager. The shared weakness is Use After Free. The vulnerability has a CVSS base score of 9.8.

CVE-2026-100209, CVE-2026-100210, CVE-2026-100211, CVE-2026-97739, CVE-2026-97745, CVE-2026-97755, CVE-2026-97759, CVE-2026-97765, CVE-2026-97778, CVE-2026-97741, CVE-2026-97742, CVE-2026-97753, CVE-2026-97756, CVE-2026-97758, CVE-2026-97761, CVE-2026-97767, CVE-2026-97776, and CVE-2026-97780 are remote code execution vulnerabilities that affect Microsoft Office Excel. Each has a CVSS base score of 8.8. CVE-2026-100209, CVE-2026-100211, CVE-2026-97745, and CVE-2026-97759 involve Use After Free. CVE-2026-100210, CVE-2026-97765 , CVE-2026-97756,  CVE-2026-97758, CVE-2026-97776, and CVE-2026-97780 involve Heap-based Buffer Overflow. CVE-2026-97739 involves Heap-based Buffer Overflow and Integer Underflow (Wrap or Wraparound). CVE-2026-97755 involves Out-of-bounds Read. CVE-2026-97778 involves Integer Overflow or Wraparound. CVE-2026-97741 involves Heap-based Buffer Overflow and Off-by-one Error. CVE-2026-97742 involves Stack-based Buffer Overflow. CVE-2026-97753 involves Heap-based Buffer Overflow and Integer Overflow or Wraparound. CVE-2026-97761 involves Stack-based Buffer Overflow. CVE-2026-97767 involves Double Free and NULL Pointer Dereference.

CVE-2026-100215 is a remote code execution vulnerability that affects Microsoft Graphics Component. The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 7.8.

CVE-2026-100219 and CVE-2026-105016 are remote code execution vulnerabilities that affect Microsoft QUIC. Each has a CVSS base score of 9.8. CVE-2026-100219 involves Use After Free. CVE-2026-105016 involves Heap-based Buffer Overflow.

CVE-2026-100220 is a remote code execution vulnerability that affects Windows Media Video Decoder. The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 8.8.

CVE-2026-102211, CVE-2026-88074, CVE-2026-108130, CVE-2026-108471, and CVE-2026-96914 are elevation of privilege vulnerabilities that affect Windows Virtualization-Based Security (VBS) Enclave. CVE-2026-102211 involves Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and Use After Free; has a CVSS base score of 7.0. CVE-2026-88074 involves Integer Overflow or Wraparound; has a CVSS base score of 7.8. CVE-2026-108130 involves Heap-based Buffer Overflow; has a CVSS base score of 7.8. CVE-2026-108471 involves Untrusted Pointer Dereference; has a CVSS base score of 8.8. CVE-2026-96914 involves Heap-based Buffer Overflow and Integer Overflow or Wraparound; has a CVSS base score of 8.8.

CVE-2026-102225 and CVE-2026-97814 are remote code execution vulnerabilities that affect Windows Text Shaping. CVE-2026-102225 involves Numeric Truncation Error and Out-of-bounds Read; has a CVSS base score of 8.8. CVE-2026-97814 involves Heap-based Buffer Overflow; has a CVSS base score of 9.8.

CVE-2026-102855, CVE-2026-102856, and CVE-2026-102857 are remote code execution vulnerabilities that affect Microsoft Office Visio. The shared weakness is Heap-based Buffer Overflow. Each has a CVSS base score of 8.8. CVE-2026-102856 involves Integer Overflow or Wraparound. CVE-2026-102857 involves Off-by-one Error.

CVE-2026-102866 is an elevation of privilege vulnerability that affects Microsoft Office SharePoint. The shared weakness is Improper Verification of Cryptographic Signature. The vulnerability has a CVSS base score of 8.1.

CVE-2026-62840 is an elevation of privilege vulnerability that affects Linux Kernel. The shared weakness is Time-of-check Time-of-use (TOCTOU) Race Condition. The vulnerability has a CVSS base score of 7.0.

CVE-2026-69802 is a remote code execution vulnerability that affects Network Device Enrollment Service (NDES). The shared weakness is Weak Authentication. The vulnerability has a CVSS base score of 8.1.

CVE-2026-70147, CVE-2026-70153, and CVE-2026-108467 are remote code execution vulnerabilities that affect Microsoft PostScript Printer Driver. The shared weakness is Heap-based Buffer Overflow. CVE-2026-70147 has a CVSS base score of 9.8. CVE-2026-70153 has a CVSS base score of 9.8. CVE-2026-108467 has a CVSS base score of 8.8.

CVE-2026-70187 is a remote code execution vulnerability that affects Windows Remote Desktop Services. The shared weakness is Use After Free. The vulnerability has a CVSS base score of 8.1.

CVE-2026-70250 is a remote code execution vulnerability that affects Windows DHCP Client. The shared weakness is Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and Use After Free. The vulnerability has a CVSS base score of 8.8.

CVE-2026-83934 is a remote code execution vulnerability that affects Windows GDI+. The shared weakness is Stack-based Buffer Overflow. The vulnerability has a CVSS base score of 8.8.

CVE-2026-88073 is an elevation of privilege vulnerability that affects Windows Graphics Kernel. The shared weakness is Use After Free. The vulnerability has a CVSS base score of 8.8.

CVE-2026-88117, CVE-2026-88119, CVE-2026-88120, CVE-2026-88171, and CVE-2026-96934 are remote code execution vulnerabilities that affect Windows DHCP Server. CVE-2026-88117, CVE-2026-88119, and CVE-2026-88120 involve Use After Free; each has a CVSS base score of 8.1. CVE-2026-88171 involves Double Free; has a CVSS base score of 8.1. CVE-2026-96934 involves Use After Free; has a CVSS base score of 9.8.

CVE-2026-96222 and CVE-2026-108131 are spoofing vulnerabilities that affect Active Directory Federation Services (AD FS). CVE-2026-96222 involves Improper Certificate Validation; has a CVSS base score of 7.4. CVE-2026-108131 has a CVSS base score of 7.5.

CVE-2026-96913 is an elevation of privilege vulnerability that affects Windows Kernel. The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 8.8.

CVE-2026-96952 is a remote code execution vulnerability that affects Microsoft Windows Media Foundation. The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 8.8.

CVE-2026-105718 is a remote code execution vulnerability that affects Microsoft Excel. The shared weakness is Improper Input Validation and Out-of-bounds Read. The vulnerability has a CVSS base score of 8.8.

CVE-2026-108400 is a remote code execution vulnerability that affects HEVC Video Extensions. The shared weakness is Integer Overflow or Wraparound. The vulnerability has a CVSS base score of 8.8.

CVE-2026-108457 is a remote code execution vulnerability that affects Microsoft Windows PDF. The shared weakness is Out-of-bounds Write. The vulnerability has a CVSS base score of 8.1.

CVE-2026-108460 is a remote code execution vulnerability that affects Windows Message Queuing. The shared weakness is Use After Free. The vulnerability has a CVSS base score of 8.1.

CVE-2026-70215, CVE-2026-88144, CVE-2026-88178, and CVE-2026-88207 are remote code execution vulnerabilities that affect Microsoft Office PowerPoint. CVE-2026-70215 and CVE-2026-88144 involve Use After Free; has a CVSS base score of 8.8. CVE-2026-88178 involves Use After Free; has a CVSS base score of 9.8. CVE-2026-88207 involves Heap-based Buffer Overflow; has a CVSS base score of 7.5.

CVE-2026-70242, CVE-2026-70291, CVE-2026-88156, CVE-2026-97016, and CVE-2026-97749 are remote code execution vulnerabilities that affect Microsoft Office Outlook. Each has a CVSS base score of 9.8. CVE-2026-70242, CVE-2026-70291, and CVE-2026-97016 involve Heap-based Buffer Overflow. CVE-2026-88156 involves Stack-based Buffer Overflow. CVE-2026-97749 involves Double Free.

CVE-2026-70269 and CVE-2026-70300 are remote code execution vulnerabilities that affect Microsoft Office Word. CVE-2026-70269 involves Heap-based Buffer Overflow and Integer Overflow or Wraparound; has a CVSS base score of 8.1. CVE-2026-70300 involves Untrusted Pointer Dereference; has a CVSS base score of 9.8.

CVE-2026-83917 is an elevation of privilege vulnerability that affects Windows ALPC. The shared weakness is Use After Free. The vulnerability has a CVSS base score of 7.0.

CVE-2026-94510 is an elevation of privilege vulnerability that affects Microsoft Bookings. The shared weakness is Authorization Bypass Through User-Controlled Key. The vulnerability has a CVSS base score of 9.9.

CVE-2026-96202 and CVE-2026-96943 are remote code execution vulnerabilities that affect Windows Raw Image Extension. The shared weakness is Heap-based Buffer Overflow. Each has a CVSS base score of 8.8. CVE-2026-96943 involves Integer Overflow or Wraparound.

CVE-2026-96207 is an elevation of privilege vulnerability that affects Microsoft Partner Center. The shared weakness is Improper Certificate Validation. The vulnerability has a CVSS base score of 10.0.

Microsoft considers exploitation of the following vulnerabilities unlikely.

CVE-2026-69789 is a remote code execution vulnerability that affects Windows Reliable Multicast Transport Driver (RMCAST). The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 7.5.

CVE-2026-88174 is a remote code execution vulnerability that affects Windows Deployment Services. The shared weakness is Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'). The vulnerability has a CVSS base score of 8.1.

CVE-2026-88185 is a remote code execution vulnerability that affects Microsoft Office Word. The shared weakness is Heap-based Buffer Overflow. The vulnerability has a CVSS base score of 8.1.

Other critical vulnerabilities

CVE-2026-69435 is an elevation of privilege vulnerability that affects Azure SRE Agent. The shared weakness is Server-Side Request Forgery (SSRF). The vulnerability has a CVSS base score of 9.6.

CVE-2026-77900 is a remote code execution vulnerability that affects Azure App Service. The shared weakness is Missing Authentication for Critical Function. The vulnerability has a CVSS base score of 9.8.

CVE-2026-83943 is an information disclosure vulnerability that affects Azure API Center. The vulnerability has a CVSS base score of 8.7.

CVE-2026-83947 is a spoofing vulnerability that affects Azure Event Grid. The shared weakness is Missing Authorization. The vulnerability has a CVSS base score of 7.7.

CVE-2026-88131 is a remote code execution vulnerability that affects Microsoft Dataverse. The shared weakness is Deserialization of Untrusted Data. The vulnerability has a CVSS base score of 9.8.

Talos would also like to highlight the following "important" vulnerabilities as Microsoft has determined that their exploitation is "more likely:"

CVE-2026-100214: Microsoft Dynamics 365 Business Central Remote Code Execution Vulnerability

CVE-2026-102217: WebDAV Elevation of Privilege Vulnerability

CVE-2026-69673: Windows Update Elevation of Privilege Vulnerability

CVE-2026-69718: Windows Update Elevation of Privilege Vulnerability

CVE-2026-69733: Windows Update Elevation of Privilege Vulnerability

CVE-2026-69783: Windows Update Elevation of Privilege Vulnerability

CVE-2026-69882: Windows Update Elevation of Privilege Vulnerability

CVE-2026-69923: Windows AI Elevation of Privilege Vulnerability

CVE-2026-69926: Desktop Window Manager Elevation of Privilege Vulnerability

CVE-2026-70054: Windows NetBIOS Elevation of Privilege Vulnerability

CVE-2026-70060: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70076: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70104: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70108: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70117: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70132: Windows Portable Device File System Driver Elevation of Privilege Vulnerability

CVE-2026-70144: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70156: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-70218: Windows StateRepository API Elevation of Privilege Vulnerability

CVE-2026-70223: Windows Console Driver Elevation of Privilege Vulnerability

CVE-2026-70233: Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVE-2026-70236: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70237: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2026-70241: Windows Kerberos Elevation of Privilege Vulnerability

CVE-2026-70245: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2026-70249: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70253: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70255: Desktop Window Manager Elevation of Privilege Vulnerability

CVE-2026-70271: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70273: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70286: Windows Graphics Component Elevation of Privilege Vulnerability

CVE-2026-70303: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-72955: Windows Application Compatibility Cache Elevation of Privilege Vulnerability

CVE-2026-81971: Windows NTFS Elevation of Privilege Vulnerability

CVE-2026-83505: Windows Setup Files Cleanup Elevation of Privilege Vulnerability

CVE-2026-83509: Windows Setup Files Cleanup Elevation of Privilege Vulnerability

CVE-2026-83510: Windows Setup Files Cleanup Elevation of Privilege Vulnerability

CVE-2026-83580: Windows Client-Side Caching (CSC) Service Elevation of Privilege Vulnerability

CVE-2026-83669: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-83699: Windows Client-Side Caching (CSC) Service Elevation of Privilege Vulnerability

CVE-2026-83704: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-83717: Windows Installer Elevation of Privilege Vulnerability

CVE-2026-83724: Windows Management Instrumentation Elevation of Privilege Vulnerability

CVE-2026-83732: Win32k Elevation of Privilege Vulnerability

CVE-2026-83735: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-83738: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2026-83750: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-83761: Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability

CVE-2026-83763: Windows Input System Elevation of Privilege Vulnerability

CVE-2026-83768: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-83769: Microsoft OpenSSH for Windows Elevation of Privilege Vulnerability

CVE-2026-83793: Windows Update Orchestrator Service Elevation of Privilege Vulnerability

CVE-2026-83830: Windows COM+ Event System Service Elevation of Privilege Vulnerability

CVE-2026-83834: Windows Kernel-Mode Drivers Elevation of Privilege Vulnerability

CVE-2026-83840: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-83842: Windows TCP/IP Elevation of Privilege Vulnerability

CVE-2026-83848: Windows COM+ Event System Service Elevation of Privilege Vulnerability

CVE-2026-83867: Windows Push Notifications Elevation of Privilege Vulnerability

CVE-2026-83886: Windows Update Orchestrator Service Elevation of Privilege Vulnerability

CVE-2026-83896: Windows Direct Composition Elevation of Privilege Vulnerability

CVE-2026-83899: Windows Installer Elevation of Privilege Vulnerability

CVE-2026-83902: Windows Direct Composition Elevation of Privilege Vulnerability

CVE-2026-83921: Windows Search Service Elevation of Privilege Vulnerability

CVE-2026-84014: Windows Device Association Service Elevation of Privilege Vulnerability

CVE-2026-85355: Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVE-2026-85791: Windows Encrypting File System (EFS) Elevation of Privilege Vulnerability

CVE-2026-85802: Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability

CVE-2026-85804: Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability

CVE-2026-85832: Windows Background Intelligent Transfer Service (BITS) Elevation of Privilege Vulnerability

CVE-2026-85843: Windows Background Intelligent Transfer Service (BITS) Elevation of Privilege Vulnerability

CVE-2026-85848: Windows Background Intelligent Transfer Service (BITS) Elevation of Privilege Vulnerability

CVE-2026-85849: Windows AppX Deployment Service Elevation of Privilege Vulnerability

CVE-2026-85850: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-85855: Windows DWM Core Library Elevation of Privilege Vulnerability

CVE-2026-85870: Windows Common Log File System Driver Elevation of Privilege Vulnerability

CVE-2026-85901: Windows Graphics Component Elevation of Privilege Vulnerability

CVE-2026-85908: Windows Graphics Component Elevation of Privilege Vulnerability

CVE-2026-85941: Windows Installer Elevation of Privilege Vulnerability

CVE-2026-85945: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-88118: Windows Background Intelligent Transfer Service (BITS) Elevation of Privilege Vulnerability

CVE-2026-88133: Windows Portable Device Enumerator Service Elevation of Privilege Vulnerability

CVE-2026-88147: Windows Secure Socket Tunneling Protocol (SSTP) Elevation of Privilege Vulnerability

CVE-2026-88152: Windows Background Intelligent Transfer Service (BITS) Elevation of Privilege Vulnerability

CVE-2026-88159: Windows Background Intelligent Transfer Service (BITS) Remote Code Execution Vulnerability

CVE-2026-88191: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-96858: Windows Security Account Manager Tampering Vulnerability

CVE-2026-96911: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-96929: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-96940: Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2026-69452: Windows Enterprise App Management Elevation of Privilege Vulnerability

CVE-2026-69880: Desktop Window Manager Elevation of Privilege Vulnerability

CVE-2026-69918: Windows Core Messaging Elevation of Privilege Vulnerability

CVE-2026-70103: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-70106: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-70151: Windows Direct Composition Elevation of Privilege Vulnerability

CVE-2026-70176: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70279: Microsoft Exchange Server Spoofing Vulnerability

CVE-2026-83785: Windows COM+ Event System Service Elevation of Privilege Vulnerability

CVE-2026-83927: Windows Registry Elevation of Privilege Vulnerability

CVE-2026-85884: Windows Health and Optimized Experiences Service Elevation of Privilege Vulnerability

CVE-2026-85902: Windows Direct Composition Elevation of Privilege Vulnerability

CVE-2026-85906: Windows Direct Composition Elevation of Privilege Vulnerability

CVE-2026-88093: Desktop Window Manager Elevation of Privilege Vulnerability

CVE-2026-96939: Servicing Stack Updates Elevation of Privilege Vulnerability

CVE-2026-97798: Windows Error Reporting Service Elevation of Privilege Vulnerability

CVE-2026-97799: Windows Audio Service Elevation of Privilege Vulnerability

CVE-2026-97800: Windows Mobile Broadband Elevation of Privilege Vulnerability

A complete list of all the other vulnerabilities Microsoft disclosed this month is available on its update page.

In response to these vulnerability disclosures, Talos is releasing a new Snort ruleset that detects attempts to exploit some of them. Please note that additional rules may be released at a future date, and current rules are subject to change pending additional information. Cisco Secure Firewall customers should use the latest update to their ruleset by updating their SRU. Open-source Snort Subscriber Ruleset customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org.

Snort 2 rule coverage: 1:67210 - 1:67273, 1:67276 - 1:67279, 1:67282 - 1:67311, 1:67313 - 1:67316, 1:67319 - 1:67322

Snort 3 rule coverage: 1:301663 - 1:301694, 1:301696, 1:301702 - 1:301703, 1:301705 - 1:301706, 1:301709, 1:301711, 1:301717 - 1:301718

The October 2026 Patch Tuesday fixes 1,414 flaws and three zero-day vulnerabilities, including an exploited Windows Shell bypass. Patch now.

Related Posts:

• Public PoC Exploit Disclosed for CVSS 10.0 GitLab Remote Code Execution Flaw CVE-2026-97229 Affecting 25,766 Hosts
• Critical Nextcloud Collabora Online Flaw CVE-2026-110447 Actively Exploited in the Wild to Deploy Webshells
• Public PoC Exploit Code and Technical Details Disclosed for CVE-2026-74580 Linux vhost Vulnerability (Vghost)

The post Microsoft October 2026 Patch Tuesday Fixes Over 1,400 Flaws and One Exploited Zero-Day appeared first on Daily CyberSecurity.

Microsoft’s October Patch Tuesday release addresses a record-breaking 1,413 vulnerabilities, including an actively exploited Windows Shell zero-day and two other publicly disclosed flaws.

Just when you thought a previous record would stand for a while, Microsoft comes out again with the largest monthly Patch Tuesday release. Microsoft has said its growing use of AI to find and fix security vulnerabilities means users should expect more fixes in its monthly updates.

How to apply patches and check if you’re protected

These updates fix security problems and help keep your Windows PC protected. Here’s how to make sure you’re up to date:

• Click the Start button, then open Settings.
• Select Windows Update (usually at the bottom of the menu on the left).
• Click Check for updates. Windows will search for the latest security updates. If you’ve enabled Get the latest updates as soon as they’re available under More options, you may be prompted to restart immediately to complete the update.
  
• Otherwise, continue to the next step.
• If updates are available, they’ll start downloading automatically. When they’re ready, click Install or Restart now if prompted. Your computer may need a restart to finish the update.
• After restarting, go back to Windows Update and check again. If it says You’re up to date, you’re all set.

Technical details

As usual, we’ve selected a few vulnerabilities to highlight for readers interested in the technical details.

We’ll start with the actively exploited vulnerability tracked as CVE-2026-96951 (CVSS score 8.8 out of 10), a Windows Shell security feature bypass vulnerability.

The security feature it can bypass is the Mark of the Web (MOTW) defense, which can warn users about potentially unsafe downloaded files.

Successful exploitation requires user interaction. For example, in an email or instant message attack, the attacker could send the targeted user a specially crafted file designed to exploit the vulnerability, but the user would have to click a link or open an attachment.

Another one to keep an eye on is CVE-2026-108398 (CVSS score 8.8 out of 10), where an untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally. The bypassed feature is Windows Defender Application Control (WDAC), which could lead to the ability to run unauthorized applications on target systems. This vulnerability was publicly disclosed before the patch.

Another publicly disclosed vulnerability is CVE-2026-92707 (CVSS score 5.3 out of 10). The flaw can let an unauthenticated remote attacker exhaust memory in affected applications that process specially crafted MessagePack data. MessagePack-CSharp is a software component that helps applications pack and unpack data in a compact format, making it efficient to store or exchange information. Exposure depends on how a service uses the library to pack and unpack the information.

From reporting threats to removing them.

Cybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.

Severity Breakdown for October 2026 Patch Tuesday 

Two Zero-Days, Both Rated Important 

Critical Flaws in Network, Identity and SharePoint Server 

See what you missed in Daily Tech Insider from Sept. 7–11.

The post AI Agents, Foldables, Cyberthreats, and Chip Deals Define This Week in Tech appeared first on TechRepublic.

Microsoft has released its monthly security update for September 2026, which includes 973 vulnerabilities affecting a range of products, including 113 that Microsoft marked as "critical."

Microsoft notes that 2 of the vulnerabilities disclosed this month have been exploited in the wild:

CVE-2026-81963 affects Windows Update Stack. CVE-2026-81963 is a elevation of privilege vulnerability associated with Improper Link Resolution Before File Access ('Link Following') and Improper Access Control and has a CVSS base score of 7.8.

CVE-2026-85880 affects Windows Advanced Local Procedure Call (ALPC). CVE-2026-85880 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and Use of Uninitialized Resource and has a CVSS base score of 7.8.

Out of 113 "critical" vulnerabilities, 82 are remote code execution (RCE) vulnerabilities.

Microsoft considers exploitation of the following vulnerabilities more likely:

CVE-2026-69676 affects Windows Kerberos. CVE-2026-69676 is a remote code execution vulnerability associated with Authentication Bypass by Capture-replay and has a CVSS base score of 8.8.

CVE-2026-69852 affects Windows Routing and Remote Access Service (RRAS). CVE-2026-69852 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.5.

CVE-2026-72957 affects Windows Deployment Services. CVE-2026-72957 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.8.

CVE-2026-69854 affects Spring Cloud Azure. CVE-2026-69854 is a elevation of privilege vulnerability associated with Improper Authentication and has a CVSS base score of 9.0.

CVE-2026-83501 affects Windows Virtualization-Based Security (VBS). CVE-2026-83501 is a information disclosure vulnerability associated with Out-of-bounds Read and has a CVSS base score of 5.5.

CVE-2026-70585 affects Windows Services for NFS ONCRPC XDR Driver. CVE-2026-70585 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 7.0.

CVE-2026-69730 affects Windows DNS Server. CVE-2026-69730 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-69857 affects Azure Cosmos DB. CVE-2026-69857 is a spoofing vulnerability associated with Authorization Bypass Through User-Controlled Key and has a CVSS base score of 8.5.

Microsoft considers exploitation of the following vulnerabilities less likely:

CVE-2026-69845 and CVE-2026-72979 affect Windows DHCP Server. CVE-2026-69845 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and Improper Input Validation and has a CVSS base score of 9.8. CVE-2026-72979 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-58599 affects HEVC Video Extensions. CVE-2026-58599 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.8.

CVE-2026-65772 affects Microsoft Dynamics 365 On-Premises. CVE-2026-65772 is a remote code execution vulnerability associated with Deserialization of Untrusted Data and has a CVSS base score of 8.8.

CVE-2026-66302 affects Skype for Business. CVE-2026-66302 is a remote code execution vulnerability associated with External Control of File Name or Path and has a CVSS base score of 9.8.

CVE-2026-67631, CVE-2026-65669, and CVE-2026-67378 affect Microsoft SQL Server. CVE-2026-67631 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-65669 is a elevation of privilege vulnerability associated with Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') and has a CVSS base score of 9.6. CVE-2026-67378 is a remote code execution vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 8.5.

CVE-2026-69499, CVE-2026-70296, CVE-2026-73023, CVE-2026-77495, and CVE-2026-73013 affect Windows Imaging Component. CVE-2026-69499 is a remote code execution vulnerability associated with Integer Overflow or Wraparound and has a CVSS base score of 8.8. CVE-2026-70296 is a remote code execution vulnerability associated with Out-of-bounds Write and has a CVSS base score of 9.8. CVE-2026-73023 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-77495 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-73013 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69501, CVE-2026-83939, CVE-2026-69906, and CVE-2026-69846 affect Windows Secure Kernel Mode. CVE-2026-69501 is a elevation of privilege vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 7.0. CVE-2026-83939 is a elevation of privilege vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 8.2. CVE-2026-69906 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.2. CVE-2026-69846 is a elevation of privilege vulnerability associated with Integer Overflow or Wraparound and has a CVSS base score of 8.2.

CVE-2026-69590 and CVE-2026-72959 affect Windows Routing and Remote Access Service (RRAS). CVE-2026-69590 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 9.8. CVE-2026-72959 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69601 affects Microsoft Windows Media Foundation. CVE-2026-69601 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-72981 affects IP Helper. CVE-2026-72981 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1.

CVE-2026-73006 affects DirectWrite. CVE-2026-73006 is a remote code execution vulnerability associated with Stack-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-73009 affects Windows Secure Socket Tunneling Protocol (SSTP). CVE-2026-73009 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-73010 and CVE-2026-78444 affect Microsoft Failover Cluster. CVE-2026-73010 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8. CVE-2026-78444 is a remote code execution vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 8.1.

CVE-2026-73017 affects Graphics Kernel. CVE-2026-73017 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.5.

CVE-2026-77493 affects Windows Graphics Component. CVE-2026-77493 is a remote code execution vulnerability associated with Double Free and has a CVSS base score of 9.8.

CVE-2026-83498 affects Windows Virtualization-Based Security (VBS) Enclave. CVE-2026-83498 is a elevation of privilege vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 7.8.

CVE-2026-69530, CVE-2026-78449, and CVE-2026-78450 affect Windows Reliable Multicast Transport Driver (RMCAST). CVE-2026-69530 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1. CVE-2026-78449 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1. CVE-2026-78450 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1.

CVE-2026-81948, CVE-2026-81950, CVE-2026-81951, CVE-2026-81959, and CVE-2026-81953 affect Microsoft Excel. CVE-2026-81948 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-81950 is a remote code execution vulnerability associated with Double Free and has a CVSS base score of 7.8. CVE-2026-81951 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-81959 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and Integer Overflow or Wraparound and has a CVSS base score of 7.8. CVE-2026-81953 is a remote code execution vulnerability associated with Stack-based Buffer Overflow and has a CVSS base score of 7.8.

CVE-2026-81354 affects Windows Hello. CVE-2026-81354 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.2.

CVE-2026-78525, CVE-2026-78520, CVE-2026-78519, and CVE-2026-78509 affect Microsoft Office Outlook. CVE-2026-78525 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-78520 is a remote code execution vulnerability associated with Out-of-bounds Read and has a CVSS base score of 6.5. CVE-2026-78519 is a remote code execution vulnerability associated with Use of Uninitialized Resource and has a CVSS base score of 8.8. CVE-2026-78509 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 9.8.

CVE-2026-81952 and CVE-2026-78510 affect Microsoft Word. CVE-2026-81952 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-78510 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 9.8.

CVE-2026-69595 and CVE-2026-78445 affect Windows Services for NFS ONCRPC XDR Driver. CVE-2026-69595 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8. CVE-2026-78445 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-73018 and CVE-2026-72986 affect Graphic Fonts. CVE-2026-73018 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-72986 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and Integer Overflow or Wraparound and has a CVSS base score of 8.8.

CVE-2026-70203 affects Windows Media Player. CVE-2026-70203 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69632, CVE-2026-77898, CVE-2026-69285, and CVE-2026-78505 affect Microsoft Office. CVE-2026-69632 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-77898 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.5. CVE-2026-69285 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-78505 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69813 and CVE-2026-77505 affect Windows DNS Server. CVE-2026-69813 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1. CVE-2026-77505 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1.

CVE-2026-78439 affects Microsoft Office Graphics Component. CVE-2026-78439 is a remote code execution vulnerability associated with Stack-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-81355 affects Virtual Hard Disk (VHD) Miniport Driver. CVE-2026-81355 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 7.5.

CVE-2026-77504 affects Microsoft Office Word. CVE-2026-77504 is a remote code execution vulnerability associated with Double Free and has a CVSS base score of 8.8.

CVE-2026-69649 affects Raw Image Extension. CVE-2026-69649 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69797, CVE-2026-69767, and CVE-2026-69678 affect Microsoft Office PowerPoint. CVE-2026-69797 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-69767 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-69678 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8.

CVE-2026-72983 affects Internet Connection Sharing (ICS). CVE-2026-72983 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-69518 affects Windows Remote Desktop. CVE-2026-69518 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69712 affects Windows Key Distribution Center. CVE-2026-69712 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.8.

Microsoft considers exploitation of the following vulnerabilities unlikely:

CVE-2026-69603, CVE-2026-72961, and CVE-2026-80083 affect Windows Hyper-V. CVE-2026-69603 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-72961 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.2. CVE-2026-80083 is a remote code execution vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 8.8.

CVE-2026-69710, CVE-2026-69725, CVE-2026-69740, CVE-2026-69784, CVE-2026-69799, CVE-2026-69820, CVE-2026-69864, and CVE-2026-72980 affect Windows Hello. CVE-2026-69710 is a elevation of privilege vulnerability associated with Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and has a CVSS base score of 7.5. CVE-2026-69725 is a elevation of privilege vulnerability associated with Double Free and has a CVSS base score of 7.8. CVE-2026-69740 is a elevation of privilege vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-69784 is a elevation of privilege vulnerability associated with Use After Free and has a CVSS base score of 8.8. CVE-2026-69799 is a elevation of privilege vulnerability associated with Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and has a CVSS base score of 7.8. CVE-2026-69820 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.2. CVE-2026-69864 is a elevation of privilege vulnerability associated with Use After Free and has a CVSS base score of 7.8. CVE-2026-72980 is a security feature bypass vulnerability associated with Uncontrolled Search Path Element and has a CVSS base score of 4.4.

CVE-2026-69769 affects Windows HTTP Print Provider. CVE-2026-69769 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 9.8.

CVE-2026-69829 affects Windows Shell. CVE-2026-69829 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 9.8.

CVE-2026-69860 affects Windows Imaging Component. CVE-2026-69860 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69874 affects Windows ALPC. CVE-2026-69874 is a elevation of privilege vulnerability associated with Untrusted Pointer Dereference and has a CVSS base score of 8.2.

CVE-2026-69890 affects Windows Virtual Trusted Platform Module. CVE-2026-69890 is a elevation of privilege vulnerability associated with Use After Free and has a CVSS base score of 7.5.

CVE-2026-70586 affects Windows Paint. CVE-2026-70586 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-72950 affects Windows Routing and Remote Access Service (RRAS). CVE-2026-72950 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-72954 affects Windows Deployment Services. CVE-2026-72954 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 7.5.

CVE-2026-72958 affects Windows Credential Guard. CVE-2026-72958 is a elevation of privilege vulnerability associated with Double Free and has a CVSS base score of 8.2.

CVE-2026-72960 affects Windows Media Player. CVE-2026-72960 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-72962 affects Windows USB Video Driver. CVE-2026-72962 is a elevation of privilege vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.2.

CVE-2026-72982 affects Windows Netlogon. CVE-2026-72982 is a remote code execution vulnerability associated with Stack-based Buffer Overflow and has a CVSS base score of 9.8.

CVE-2026-72987 affects Windows DNS. CVE-2026-72987 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1.

CVE-2026-81949 affects Microsoft Excel. CVE-2026-81949 is a remote code execution vulnerability associated with Integer Overflow or Wraparound and has a CVSS base score of 7.8.

CVE-2026-81352 affects Web Media Extensions. CVE-2026-81352 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-81955 affects Windows Graphics Component. CVE-2026-81955 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8.

CVE-2026-69858 and CVE-2026-69827 affect Windows DNS Server. CVE-2026-69858 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 8.1. CVE-2026-69827 is a remote code execution vulnerability associated with Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and Use After Free and has a CVSS base score of 8.1.

CVE-2026-67643 and CVE-2026-67636 affect Microsoft SQL Server. CVE-2026-67643 is a remote code execution vulnerability associated with Heap-based Buffer Overflow and has a CVSS base score of 8.8. CVE-2026-67636 is a remote code execution vulnerability associated with Out-of-bounds Read and has a CVSS base score of 8.5.

CVE-2026-69579 affects Windows Message Queuing. CVE-2026-69579 is a remote code execution vulnerability associated with Use After Free and has a CVSS base score of 9.8.

CVE-2026-70351 affects Microsoft WebP Image Extension. CVE-2026-70351 is a remote code execution vulnerability associated with Integer Overflow or Wraparound and Heap-based Buffer Overflow and has a CVSS base score of 8.8.

Other critical vulnerabilities:

CVE-2026-62916 affects Microsoft Entra ID. CVE-2026-62916 is a elevation of privilege vulnerability associated with Authentication Bypass Using an Alternate Path or Channel and has a CVSS base score of 9.1.

CVE-2026-83941 affects Entra ID. CVE-2026-83941 is a elevation of privilege vulnerability associated with Missing Authorization and has a CVSS base score of 9.9.

CVE-2026-65818 affects Power Automate. CVE-2026-65818 is a elevation of privilege vulnerability associated with Server-Side Request Forgery (SSRF) and has a CVSS base score of 8.5.

CVE-2026-80098 affects Copilot Studio. CVE-2026-80098 is a elevation of privilege vulnerability associated with Improper Verification of Cryptographic Signature and has a CVSS base score of 9.3.

CVE-2026-83711 affects Microsoft Azure Active Directory B2C. CVE-2026-83711 is a elevation of privilege vulnerability associated with Authorization Bypass Through User-Controlled Key and has a CVSS base score of 10.0.

CVE-2026-70178 affects Microsoft Fabric. CVE-2026-70178 is a elevation of privilege vulnerability associated with Missing Authorization and has a CVSS base score of 8.5.

CVE-2026-70352 affects Azure AI Language. CVE-2026-70352 is a elevation of privilege vulnerability associated with Missing Authentication for Critical Function and has a CVSS base score of 10.0.

CVE-2026-62906 affects Microsoft Discovery Studio. CVE-2026-62906 is a information disclosure vulnerability associated with Improper Neutralization of Special Elements in Data Query Logic and has a CVSS base score of 7.4.

Talos would also like to highlight the following "important" vulnerabilities as Microsoft has determined that their exploitation is "more likely:"

CVE-2026-68846: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-68876: Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability

CVE-2026-68880: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-68884: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-69274: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-69277: Microsoft Local Security Authority (LSA) Server Elevation of Privilege Vulnerability

CVE-2026-69301: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-69305: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-69310: Windows DNS Elevation of Privilege Vulnerability

CVE-2026-69337: Windows Registry Elevation of Privilege Vulnerability

CVE-2026-69364: Windows Print Spooler Components Elevation of Privilege Vulnerability

CVE-2026-69385: Windows TCP/IP Elevation of Privilege Vulnerability

CVE-2026-69391: Windows Broker Infrastructure Service Elevation of Privilege Vulnerability

CVE-2026-69406: Windows Kernel Information Disclosure Vulnerability

CVE-2026-69436: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-69450: Windows Error Reporting Elevation of Privilege Vulnerability

CVE-2026-69451: Windows Management Instrumentation Elevation of Privilege Vulnerability

CVE-2026-69459: Windows Power Dependency Coordinator Elevation of Privilege Vulnerability

CVE-2026-69466: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-69473: Windows Kernel Elevation of Privilege Vulnerability

CVE-2026-69478: Windows Device Association Service Elevation of Privilege Vulnerability

CVE-2026-69498: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-69525: Remote Desktop Services Remote Code Execution Vulnerability

CVE-2026-69541: Virtual Hard Disk (VHD) Miniport Driver Elevation of Privilege Vulernability

CVE-2026-69585: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-69600: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-69605: Microsoft Install Service Elevation of Privilege Vulnerability

CVE-2026-69623: Windows HTTP Print Provider Remote Code Execution Vulnerability

CVE-2026-69714: Windows Device Association Service Elevation of Privilege Vulnerability

CVE-2026-69723: Windows Kernel Information Disclosure Vulnerability

CVE-2026-69757: Windows TCP/IP Elevation of Privilege Vulnerability

CVE-2026-69777: Windows DHCP Client Elevation of Privilege Vulnerability

CVE-2026-69779: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-69832: Win32k Information Disclosure Vulnerability

CVE-2026-69911: Microsoft Windows Search Component Elevation of Privilege Vulnerability

CVE-2026-69921: Windows Print Spooler Components Elevation of Privilege Vulnerability

CVE-2026-70289: Windows Win32k Elevation of Privilege Vulnerability

CVE-2026-70342: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

CVE-2026-70562: Windows Audio Service Elevation of Privilege Vulnerability

CVE-2026-70583: Windows Core Messaging Elevation of Privilege Vulnerability

CVE-2026-71340: Windows File History Service Elevation of Privilege Vulnerability

CVE-2026-72936: Windows SMB Client Remote Code Execution Vulnerability

CVE-2026-77500: Windows Device Association Service Elevation of Privilege Vulnerability

CVE-2026-78454: Windows CD-ROM Driver Information Disclosure Vulnerability

CVE-2026-69460: Windows Modern Device Management (MDM) Elevation of Privilege Vulnerability

CVE-2026-69467: Microsoft Graphics Component Elevation of Privilege Vulnerability

CVE-2026-80093: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

CVE-2026-72940: Windows Schannel Remote Code Execution Vulnerability

CVE-2026-71343: Windows Remote Access Connection Manager Remote Code Execution Vulnerability

CVE-2026-69366: Windows Kernel Elevation of Privilege Vulnerability

A complete list of all the other vulnerabilities Microsoft disclosed this month is available on its update page.

In response to these vulnerability disclosures, Talos is releasing a new Snort ruleset that detects attempts to exploit some of them. Please note that additional rules may be released at a future date, and current rules are subject to change pending additional information. Cisco Secure Firewall customers should use the latest update to their ruleset by updating their SRU. Open-source Snort Subscriber Ruleset customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org.

Snort 2 rule coverage: SIDs 67011-67032 and 67036-67084.

Snort 3 rule coverage: SIDs 301619-301629, 301632-301655, and 67046.

September 2026 Patch Tuesday fixes a record 974 CVEs including 2 exploited zero-days, 20 wormable bugs, and a critical Exchange RCE via Visio email.

Microsoft’s September 2026 Patch Tuesday set a new record. Depending on how researchers count external and Chromium bugs, Microsoft fixed between 966 and 997 CVEs in this update. The company also fixed another 204 vulnerabilities earlier in September across Azure, Entra ID, Edge, and other services. This means the total number of September fixes is already much higher than the headline figure.

“It’s a new record release from Microsoft, but, again, that seems to be the new normal. As always, counting this beast is tricky, but I see 972 new CVEs rolling out from Redmond this month.” reads the report published by ZDI. “On the one hand, congrats to the security gnomes at Microsoft for being able to patch bugs at this rate. On the other hand, AI-assisted vulnerability discovery shows no signs of slowing down. However, we have not seen a correlating spike in active exploits – yet.”

The number of addressed issues skyrockets due to the use of AI for code auditing in the monthly counts, it has been climbing steadily through 2026. What hasn’t arrived yet, and ZDI notes the absence explicitly, is a corresponding spike in active exploits, though 58 of this month’s fixes are rated by Microsoft as more likely to be exploited.

The two vulnerabilities already under attack both allow attackers to gain higher privileges. CVE-2026-85880 (CVSS score of 7.8) is a heap buffer overflow in Windows Advanced Local Procedure Call (ALPC). It lets a local attacker gain SYSTEM-level privileges, and the researchers note it is only the second ALPC zero-day Microsoft has patched since January 2023.

CVE-2026-81963 (CVSS score of 7.8) flaw resides in the Windows Update Stack. It lets an attacker follow a malicious link and escalate privileges. It is the first Update Stack vulnerability that Microsoft has confirmed attackers actively exploiting. Both flaws require local access and user-level privileges, so attackers would likely use them after gaining an initial foothold and then use them to gain higher privileges.

The Exchange Server situation this month is more pressing than either zero-day. CVE-2026-55007 is a remote code execution vulnerability that deserves immediate attention.

“An unauthenticated attacker could send a specially crafted Visio attachment to an affected Exchange server. The server could process the attachment during content indexing, and successful exploitation could allow the attacker to execute code on the server. User interaction is not required.” reads the advisory. “Successful exploitation requires the target system to be under sustained low-memory (memory pressure) conditions, which are not commonly present in normal operation. This makes the vulnerability difficult to reliably trigger, as the attacker must first induce or wait for a constrained memory state before exploitation becomes possible.”

Microsoft rates the exploit as unreliable, but an attacker trying repeatedly only needs to succeed once. A second Exchange bug, CVE-2026-69380 (CVSS 8.1), is also a priority: it lets a low-privileged authenticated attacker impersonate any user in the organization and hijack every mailbox. If your Exchange servers face the internet, test and deploy these patches immediately.

Remote Desktop Services adds another urgent item: CVE-2026-69525 (CVSS score of 9.8) is a use-after-free bug that lets an unauthenticated in-network attacker execute arbitrary code. Microsoft specifies an “in-network” requirement, but the CVSS network vector score suggests any network path could be relevant. RDP is everywhere in enterprise environments, and that CVSS score combined with the unauthenticated attack path makes this one worth treating as urgent regardless of the technical qualifier.

Microsoft also fixed 20 wormable vulnerabilities. These flaws let remote, unauthenticated attackers execute code without any user interaction, creating the kind of conditions that can help malware spread from system to system. The affected components include DHCP Server, Active Directory, Windows DNS Server, SMB Client, Netlogon, NFS, RRAS, IP Helper, Message Queuing, and others. One DNS flaw, CVE-2026-69730, has a CVSS score of 9.8. ZDI calls it a “SigRed’s spiritual successor,” referring to the critical DNS flaw exploited in 2020. Fixing 20 wormable bugs in one Patch Tuesday is an unusually high number.

Microsoft also patched 17 SharePoint flaws, including four that allow remote code execution, and more than 60 SQL Server vulnerabilities. One SQL Server flaw affects SQL Copilot in SQL Server Management Studio. Microsoft also fixed an Android Microsoft Authenticator flaw that can let a malicious app gain valid access tokens after the user completes an authentication step. Teams should prioritize these fixes based on their own environments, but they should not ignore any of them.

The full list of vulnerabilities addressed by Microsoft this month is available here.

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Patch Tuesday)

Microsoft’s September 2026 Patch Tuesday addresses 964 CVEs, including 104 rated Critical and 860 rated Important, making it the company’s largest Patch Tuesday release on record.

Microsoft lists 974 CVEs in its full September security release. However, 10 of those affect cloud services or involve fixes that Microsoft applies itself, leaving 964 vulnerabilities that customers need to patch.

The release includes fixes for two actively exploited Windows zero-days. Both are local elevation-of-privilege vulnerabilities that could allow an attacker who already has access to a device to gain SYSTEM privileges. Neither provides remote access by itself, but SYSTEM-level access is valuable to malware operators after they gain an initial foothold through phishing, stolen credentials, or another method.

How to apply patches and check if you’re protected

These updates fix security problems and help keep your Windows PC protected. Here’s how to make sure you’re up to date:

• Click the Start button, then open Settings.
• Select Windows Update (usually at the bottom of the menu on the left).
• Click Check for updates. Windows will search for the latest security updates. If you’ve enabled Get the latest updates as soon as they’re available under More options, you may be prompted to restart immediately to complete the update. Otherwise, continue to the next step.

• If updates are available, they’ll start downloading automatically. When they’re ready, click Install or Restart now if prompted. Your computer may need a restart to finish the update.
• After restarting, go back to Windows Update and check again. If it says You’re up to date, you’re all set.
  

Technical details

The unusually large batch also includes high-severity remote-code-execution vulnerabilities in Windows DNS Server and Remote Desktop Services, as well as fixes affecting Exchange Server, SharePoint, SQL Server, Office, and core Windows components.

Let’s take a closer look at the two zero-day vulnerabilities. Microsoft classifies a vulnerability as a zero-day if it was publicly disclosed or actively exploited before an official fix became available.

The first is a Windows Update Stack elevation-of-privilege (EoP) vulnerability with a CVSS score of 7.8 out of 10, tracked as CVE-2026-81963. The description says:

“Improper link resolution before file access (‘link following’) in Windows Update Stack allows an authorized attacker to elevate privileges locally.”

This means Windows can be persuaded to open or modify the wrong file because it follows a shortcut-like pointer without properly checking where that pointer leads. Microsoft says attackers exploited the bug before a patch was available.

The second zero-day, tracked as CVE-2026-85880, also has a CVSS score of 7.8 out of 10. Microsoft describes it as:

“heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.”

Microsoft says an attacker who can execute code in a low-privilege AppContainer could exploit the vulnerability locally to escape the sandbox and elevate their privileges on the affected system. No additional user interaction is required.

Windows ALPC is an internal messaging system in the Windows operating system that allows different programs on the same computer to communicate with each other quickly.

A buffer overflow occurs when an area of memory within a software application reaches its boundary and data spills into an adjacent memory region. The heap is a region of memory used for dynamic memory allocation.

These are not the kinds of bugs a typical victim triggers merely by opening a malicious document or visiting a website. But local privilege escalation is a critical part of many attack chains: After malware runs with limited rights, a SYSTEM-level exploit can help an intruder disable defenses, access protected data, establish persistence, or move through a network.

From reporting threats to removing them.

Cybersecurity risks should never spread beyond a headline. Keep threats off your devices by downloading Malwarebytes today.

Microsoft has yet to set a firm Exchange Server SE CU1 release date as engineers work through AI-assisted security findings and ongoing patch releases.

The post Microsoft Exchange Server SE CU1 Delayed Amid AI-Assisted Security Reviews appeared first on TechRepublic.

Microsoft’s August Patch Tuesday fixes about 400 security flaws, including an actively exploited Windows zero-day and multiple 9.8-rated RCE bugs.

The post Microsoft’s August Patch Tuesday: 400+ Bugs Fixed, One Zero-Day Already Under Attack appeared first on TechRepublic.

Microsoft’s August 2026 Patch Tuesday addresses 421 Microsoft vulnerabilities, including 62 rated Critical. One Windows vulnerability has been exploited in the wild by the Lazarus group to gain SYSTEM privileges.

The August update is smaller than July’s record-breaking release, but it’s still among Microsoft’s largest Patch Tuesday batches. More importantly, it includes several flaws likely to attract attacker interest: a publicly disclosed Windows privilege escalation flaw with a proof-of-concept (PoC), a newly completed unauthenticated SharePoint remote code execution (RCE) chain, and a potentially wormable Windows DNS Server flaw.

How to apply patches and check if you’re protected

These updates fix security problems and help keep your Windows PC protected. Here’s how to make sure you’re up to date:

• Click the Start button, then open Settings.
• Select Windows Update (usually at the bottom of the menu on the left).
• Click Check for updates. Windows will search for the latest security updates. If you’ve enabled Get the latest updates as soon as they’re available under More options, you may be prompted to restart immediately to complete the update. Otherwise, continue to the next step.

• If updates are available, they’ll start downloading automatically. When they’re ready, click Install or Restart now if prompted. Your computer may need a restart to finish the update.
• After restarting, go back to Windows Update and check again. If it says You’re up to date, you’re all set.

Technical details

Windows Deployment Services (WDS) users should prioritize CVE-2026-62893 (CVSS score 9.8 out of 10), an unauthenticated RCE flaw in the TFTP (Trivial File Transfer Protocol) server. TFTP normally runs on UDP port 69 and has no built-in authentication. It is primarily an enterprise and school network issue, but it could enable lateral movement where WDS is deployed.

Microsoft also fixed CVE-2026-62832, a publicly disclosed elevation of privilege (EoP) vulnerability in the Windows User Profile Service. It maps to the issue researchers called LegacyHive, for which a limited public proof of concept was released in July.

The PoC demonstrates how a local authenticated attacker could abuse the service’s registry hive handling to load another user’s hive, potentially including an administrator’s. The released demonstration is deliberately constrained and requires credentials for another user, but the availability of code and the broad Windows footprint make this one a strong candidate for exploitation attempts.

Another good reason to promptly update is the number (I counted 48) of remote code execution (RCE) fixes for Office applications and components, including Excel, Word, Outlook, PowerPoint, and the Office graphics component. Document-borne vulnerabilities are attractive to phishing operators because email attachments and shared documents provide delivery mechanisms that people are likely to open.

“One of the best cybersecurity suites on the planet.” 

According to CNET. Read their review →

Microsoft has released its monthly security update for August 2026, which includes 421 vulnerabilities affecting a range of products, including 62 that Microsoft marked as "critical." 

Microsoft notes that 1 of the vulnerabilities disclosed this month have been exploited in the wild 

CVE-2026-68820 is an elevation of privilege vulnerability affecting Windows Ancillary Function Driver for WinSock. A Use After Free vulnerability could allow an authorized attacker to elevate privileges locally. This vulnerability has a CVSS base score of 7.0. 

Out of 62 "critical" vulnerabilities, 40 are remote code execution (RCE) vulnerabilities. 

Microsoft considers exploitation of the following vulnerabilities more likely. 

CVE-2026-62893 is a remote code execution vulnerability affecting Windows Deployment Services TFTP Server. A Use After Free could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 9.8. 

CVE-2026-65665 is a remote code execution vulnerability affecting Microsoft SharePoint Server. Deserialization of Untrusted Data could allow an authorized attacker to execute code over a network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-62823 is a remote code execution vulnerability affecting Windows DHCP Server. A Heap-based Buffer Overflow could allow an unauthorized attacker to execute code over an adjacent network. This vulnerability has a CVSS base score of 8.8. 

Microsoft considers exploitation of the following vulnerabilities less likely. 

CVE-2026-62830 is an elevation of privilege vulnerability affecting Azure SRE Agent. Missing Authorization could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.9. 

CVE-2026-50516 is an elevation of privilege vulnerability affecting Microsoft Azure Kubernetes Service. Missing Authentication for Critical Function could allow an unauthorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.4. 

Three remote code execution vulnerabilities, CVE-2026-68794, CVE-2026-68816 and CVE-2026-68804, affect Microsoft Excel and have a CVSS base score of 7.8. An unauthorized attacker could execute code locally. CVE-2026-68794 is a Heap-based Buffer Overflow. CVE-2026-68816 is a Stack-based Buffer Overflow. CVE-2026-68804 involves a Numeric Truncation Error and a Heap-based Buffer Overflow. 

CVE-2026-62911 is an elevation of privilege vulnerability affecting Microsoft Exchange Server. Authentication Bypass by Capture-replay could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 8.0. 

Nine remote code execution vulnerabilities, CVE-2026-63515, CVE-2026-65657, CVE-2026-63532, CVE-2026-64898, CVE-2026-64903, CVE-2026-64909, CVE-2026-64910, CVE-2026-64911 and CVE-2026-70130, affect Microsoft Office and could allow an unauthorized attacker to execute code locally. CVE-2026-63515 involves an Out-of-bounds Read and an Integer Underflow (Wrap or Wraparound) and has a CVSS base score of 7.8. CVE-2026-65657 is a Use After Free and has a CVSS base score of 7.8. CVE-2026-63532 involves an Integer Overflow or Wraparound and a Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-64898 involves a Heap-based Buffer Overflow and an Integer Overflow or Wraparound and has a CVSS base score of 7.8. CVE-2026-64903 involves an Integer Overflow or Wraparound and a Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-64909 involves an Integer Underflow (Wrap or Wraparound), an Out-of-bounds Read and a Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-64910 is an Untrusted Pointer Dereference and has a CVSS base score of 7.8. CVE-2026-64911 involves an Integer Overflow or Wraparound and a Heap-based Buffer Overflow and has a CVSS base score of 7.8. CVE-2026-70130 is a Heap-based Buffer Overflow and has a CVSS base score of 8.4. 

Five remote code execution vulnerabilities, CVE-2026-63513, CVE-2026-63519, CVE-2026-65664, CVE-2026-63526 and CVE-2026-66807, affect Microsoft Office Graphics Component and have a CVSS base score of 7.8. An unauthorized attacker could execute code locally. CVE-2026-63513 is a Heap-based Buffer Overflow. CVE-2026-63519 is a Heap-based Buffer Overflow. CVE-2026-65664 is a Heap-based Buffer Overflow. CVE-2026-63526 is a Stack-based Buffer Overflow. CVE-2026-66807 is a Stack-based Buffer Overflow. 

Three remote code execution vulnerabilities, CVE-2026-63518, CVE-2026-63525 and CVE-2026-64907, affect Microsoft Office Word and have a CVSS base score of 7.8. An unauthorized attacker could execute code locally. CVE-2026-63518is a Heap-based Buffer Overflow. CVE-2026-63525 is a Numeric Truncation Error. CVE-2026-64907 is a Stack-based Buffer Overflow.https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62827 

Two elevation of privilege vulnerabilities, CVE-2026-62827 and CVE-2026-64921, affect Microsoft SharePoint Server and have a CVSS base score of 8.8. An authorized attacker could elevate privileges over a network. CVE-2026-62827involves Improper Authentication. CVE-2026-64921 involves Missing Authentication for Critical Function. 

CVE-2026-62824 is a remote code execution vulnerability affecting Remote Desktop Client. A Stack-based Buffer Overflow could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-62818 is a remote code execution vulnerability affecting Windows Active Directory Certificate Services (AD CS). A Use After Free could allow an authorized attacker to execute code over a network. This vulnerability has a CVSS base score of 8.8. 

Three remote code execution vulnerabilities, CVE-2026-62817, CVE-2026-62820 and CVE-2026-62878, affect Windows DNS Server. CVE-2026-62817 is an Out-of-bounds Write that could allow an unauthorized attacker to execute code over an adjacent network and has a CVSS base score of 8.8. CVE-2026-62820 involves Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition'), could allow an unauthorized attacker to execute code over a network and has a CVSS base score of 8.1. CVE-2026-62878 is a Stack-based Buffer Overflow that could allow an unauthorized attacker to execute code over a network and has a CVSS base score of 9.8. 

Two remote code execution vulnerabilities, CVE-2026-66802 and CVE-2026-71331, affect Windows Device Health Attestation (DHA), could allow an unauthorized attacker to execute code over a network and have a CVSS base score of 8.1. CVE-2026-66802 involves Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') and a Use After Free. CVE-2026-71331 involves an Integer Overflow or Wraparound and a Heap-based Buffer Overflow. 

Two remote code execution vulnerabilities, CVE-2026-62890 and CVE-2026-62822, affect Windows GDI+. CVE-2026-62890 is a Heap-based Buffer Overflow that could allow an authorized attacker to execute code locally and has a CVSS base score of 7.8. CVE-2026-62822 involves an Integer Overflow or Wraparound and a Heap-based Buffer Overflow, could allow an unauthorized attacker to execute code over a network and has a CVSS base score of 8.8. 

CVE-2026-66799 is an elevation of privilege vulnerability affecting Windows Key Guard. A Heap-based Buffer Overflow could allow an authorized attacker to elevate privileges locally. This vulnerability has a CVSS base score of 7.8. 

CVE-2026-62816 is a remote code execution vulnerability affecting Windows Reliable Multicast Transport Driver (RMCAST). A Heap-based Buffer Overflow and an Integer Overflow or Wraparound could allow an unauthorized attacker to execute code over an adjacent network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-62819 is a remote code execution vulnerability affecting Windows Routing and Remote Access Service (RRAS). A Use After Free could allow an attacker to gain unauthorized access to a victim's machine. This vulnerability has a CVSS base score of 8.1. 

CVE-2026-62889 is a remote code execution vulnerability affecting Windows Secure Socket Tunneling Protocol (SSTP). A Double Free could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 8.1. 

Microsoft considers exploitation of the following vulnerabilities unlikely. 

CVE-2026-65789 is a remote code execution vulnerability affecting Windows DNS Server. A Use After Free could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 8.1. 

CVE-2026-65791 is a remote code execution vulnerability affecting Windows iSCSI Target Service. A Heap-based Buffer Overflow could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 9.8. 

Other critical vulnerabilities 

CVE-2026-49163 is an elevation of privilege vulnerability affecting Application Insights Profiler. Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-50481 is an elevation of privilege vulnerability affecting Azure Active Directory. Modification of Assumed-Immutable Data (MAID) could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.9. 

CVE-2026-68823 is a remote code execution vulnerability affecting Azure Confidential Ledger. Exposed Dangerous Method or Function could allow an authorized attacker to execute code over a network. This vulnerability has a CVSS base score of 9.1. 

CVE-2026-62869 affects Azure Entra ID. Insufficient Verification of Data Authenticity could allow an authorized attacker to perform spoofing over a network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-56161 is an information disclosure vulnerability affecting Azure Logic Apps. Improper Access Control could allow an authorized attacker to disclose information over a network. This vulnerability has a CVSS base score of 9.6. 

Two elevation of privilege vulnerabilities, CVE-2026-63522 and CVE-2026-56162, affect Azure SQL Database. CVE-2026-63522 involves Incorrect Permission Assignment for Critical Resource, could allow an authorized attacker to elevate privileges locally and has a CVSS base score of 7.8. CVE-2026-56162 involves Improper Authentication, could allow an unauthorized attacker to elevate privileges over a network and has a CVSS base score of 10.0. 

CVE-2026-62836 is an elevation of privilege vulnerability affecting Azure SQL Managed Instance. Improper Restriction of Communication Channel to Intended Endpoints could allow an unauthorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 8.7. 

CVE-2026-50515 is a remote code execution vulnerability affecting Azure Service Bus. Deserialization of Untrusted Data could allow an authorized attacker to execute code over a network. This vulnerability has a CVSS base score of 9.9. 

CVE-2026-62873 is an elevation of privilege vulnerability affecting Microsoft 365 Admin Center. Improper Verification of Cryptographic Signature could allow an unauthorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.8. 

CVE-2026-59115 is an elevation of privilege vulnerability affecting Microsoft Entra Provisioning Service. Path Traversal: '.../...//' could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.9. 

CVE-2026-70332 affects Microsoft Office SharePoint. Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') could allow an unauthorized attacker to perform spoofing over a network. This vulnerability has a CVSS base score of 9.6. 

CVE-2026-63508 is an elevation of privilege vulnerability affecting Microsoft Planetary Computer Pro. Missing Authentication for Critical Function could allow an unauthorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 10.0. 

CVE-2026-59118 is an elevation of privilege vulnerability affecting Copilot Cowork. Improper Authorization could allow an unauthorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 9.3. 

CVE-2026-65668 is an elevation of privilege vulnerability affecting Microsoft Purview eDiscovery. Improper Access Control could allow an authorized attacker to elevate privileges over a network. This vulnerability has a CVSS base score of 8.8. 

CVE-2026-62815 is a remote code execution vulnerability affecting Microsoft QUIC. A Use After Free could allow an unauthorized attacker to execute code over a network. This vulnerability has a CVSS base score of 9.8.  

Three vulnerabilities, CVE-2026-62896, CVE-2026-62918 and CVE-2026-65667, affect Microsoft Teams. CVE-2026-62896 is an elevation of privilege vulnerability involving Improper Authentication that could allow an authorized attacker to elevate privileges over a network and has a CVSS base score of 9.6. CVE-2026-62918 involves Improper Verification of Cryptographic Signature that could allow an unauthorized attacker to perform spoofing over a network and has a CVSS base score of 7.5. CVE-2026-65667 is an elevation of privilege vulnerability involving Missing Authorization that could allow an unauthorized attacker to elevate privileges over a network and has a CVSS base score of 10.0.  

Talos would also like to highlight the following "important" vulnerabilities as Microsoft has determined that their exploitation is "more likely:" 

CVE-2026-58650: Visual Studio Code Security Feature Bypass Vulnerability 

CVE-2026-63520: Microsoft SharePoint Server Remote Code Execution Vulnerability 

CVE-2026-59124: Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability 

CVE-2026-59133: Microsoft High Performance Computing (HPC) Pack Elevation of Privilege Vulnerability 

CVE-2026-59132: Windows TCP/IP Denial of Service Vulnerability 

CVE-2026-61348: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability 

CVE-2026-61925: Windows Installer Elevation of Privilege Vulnerability 

CVE-2026-61930: Windows Kernel Elevation of Privilege Vulnerability 

CVE-2026-62688: Windows MIDI Service Module Elevation of Privileges Vulnerability 

CVE-2026-62696: Windows Program Compatibility Assistant Service Elevation of Privilege Vulnerability 

CVE-2026-62713: Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability 

CVE-2026-62712: Windows Win32k Elevation of Privilege Vulnerability 

CVE-2026-62735: Windows HTTP.sys Elevation of Privilege Vulnerability 

CVE-2026-62737: Windows Kernel Elevation of Privilege Vulnerability 

CVE-2026-62783: Windows Remote Access Connection Manager Elevation of Privilege Vulnerability 

CVE-2026-62766: Windows Kerberos Elevation of Privilege Vulnerability 

CVE-2026-65788: Desktop Window Manager Elevation of Privilege Vulnerability 

CVE-2026-69278: Visual Studio Code Security Feature Bypass Vulnerability 

CVE-2026-70307: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability 

CVE-2026-70335: GitHub Copilot and Visual Studio Code Elevation of Privilege Vulnerability 

CVE-2026-66804: Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability 

CVE-2026-70355: Microsoft SharePoint Server Elevation of Privilege Vulnerability 

CVE-2026-61358: Windows Accessibility Infrastructure (ATBroker.exe) Elevation of Privilege Vulnerability 

CVE-2026-61929: Windows Kernel Elevation of Privilege Vulnerability 

CVE-2026-62698: Microsoft Digest Authentication Elevation of Privilege Vulnerability 

CVE-2026-62721: Windows User-Mode Power Service (UMPS) Elevation of Privilege Vulnerability 

CVE-2026-62741: Windows HTTP.sys Elevation of Privilege Vulnerability 

CVE-2026-62788: Windows Kernel Elevation of Privilege Vulnerability 

CVE-2026-62832: Windows User Profile Service Elevation of Privilege Vulnerability 

CVE-2026-62888: Windows DWM Core Library Elevation of Privilege Vulnerability 

CVE-2026-65775: Windows Win32k Elevation of Privilege Vulnerability 

A complete list of all the other vulnerabilities Microsoft disclosed this month is available on its update page. 

In response to these vulnerability disclosures, Talos is releasing a new Snort ruleset that detects attempts to exploit some of them. Please note that additional rules may be released at a future date, and current rules are subject to change pending additional information. Cisco Secure Firewall customers should use the latest update to their ruleset by updating their SRU. Open-source Snort Subscriber Ruleset customers can stay up to date by downloading the latest rule pack available for purchase on Snort.org. 

Snort 2 rule coverage: 1:66902-1:66910, 1:66912-1:66923, 1:66929-1:66932, 1:66935-1:66948 

Snort 3 rule coverage: 1:66902, 1:301589-1:301607 

August 2026 Patch Tuesday Zero-days 

August 2026 Security Updates 

Microsoft fixed a record 570 security flaws in July 2026 Patch Tuesday, including three zero-days and two exploited bugs.

The post Microsoft Fixes Record 570 Security Flaws in Biggest Patch Tuesday Ever appeared first on TechRepublic.