An anonymous security researcher known as Nightmare Eclipse has released a new Microsoft Defender zero-day exploit named "ShieldCrash" right after Microsoft rolled out its September 2026 Patch Tuesday security updates. [...]

Microsoft is adding new age-awareness APIs to Windows 11 that will allow apps to determine whether someone is a child, teenager, or adult without exposing their exact date of birth. [...]

Microsoft has released the Windows 10 KB5122878 extended security update, which includes this month's record-breaking September 2026 Patch Tuesday fixes, along with a few bug fixes. [...]

Today is Microsoft's September 2026 Patch Tuesday, with security updates released for a record-breaking 966 flaws, including two actively exploited zero-day vulnerabilities. [...]

Microsoft has released Windows 11 KB5124008 and KB5122880 cumulative updates for versions 25H2/24H2 and 23H2 to fix security vulnerabilities, bugs, and add new features. [...]

Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled. [...]

Microsoft warned customers last week that they may experience application crashes on some Windows Server 2025 due to recent memory management changes. [...]

Microsoft is working to resolve a known issue that causes delays or blocks some users from opening the Microsoft Teams desktop client on Windows systems. [...]

Microsoft is working to resolve an ongoing Exchange Online outage that is delaying email sent to and received from external domains. [...]

Microsoft says a known issue that reverts mouse settings after installing the KB5120998 August 2026 preview update affects only non-English Windows 11 systems. [...]

Microsoft has confirmed that desktop settings are lost or reset on some Windows devices after installing the KB5120998 August 2026 preview update. [...]

Microsoft is working to fix a known issue that causes crashes and launch failures for Microsoft Teams and New Outlook users after installing updates released since the August 2026 Patch Tuesday. [...]

Microsoft is investigating an issue causing the Defender for Office 365 security software to mistakenly block access to legitimate Google search links. [...]

Nearly 22,000 Microsoft Exchange servers exposed online remain unpatched against a high-severity authentication bypass vulnerability that allows attackers to hijack all user mailboxes. [...]

Microsoft is investigating a widespread service issue causing authentication issues, email delays and failures, and various other issues for Exchange Online customers. [...]

Microsoft asked customers this week to ignore alerts that Defender Antivirus has been turned off after installing the latest Defender updates. [...]

Microsoft has started rolling out a permanent fix for a known issue that causes system crashes and gaming issues on Windows 11 devices. [...]

Microsoft has begun testing new privacy controls that will let Windows 11 users choose which desktop applications can access their camera, microphone, and precise location. [...]

Microsoft updated its Windows PowerToys toolset with a new utility dubbed "Window Hopper" that lets users switch between an app's windows more quickly. [...]

Microsoft has confirmed that .NET Framework updates released as part of the August 2026 Patch Tuesday are breaking printing and PDF export in WPF applications. [...]