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Microsoft Releases Windows 10 KB5131096 Security Update Addressing 1,235 Vulnerabilities

Microsoft Releases Windows 10 KB5131096 Security Update Addressing 1,235 Vulnerabilities

First seen 10 Nov 2026, 20:49 UTC • •
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ThreatCluster AI
ThreatCluster •November 10, 2026 at 20:50 UTC
  • •KB5131096 fixes 1,235 vulnerabilities, including an actively exploited Outlook flaw.
  • •Available for Windows 10 Enterprise LTSC users and ESU program participants.
  • •Update includes bug fixes for printing and Remote Desktop issues.

On November 10, 2026, Microsoft released the Windows 10 KB5131096 extended security update, which includes security fixes for 1,235 vulnerabilities across its products. Notably, this update addresses an actively exploited Outlook zero-day flaw. Users running Windows 10 Enterprise LTSC or enrolled in the ESU program can install the update via Windows Update. The update also includes adjustments to daylight saving time rules for Cuba and several bug fixes related to printing and Remote Desktop functionalities. The update brings Windows 10 to build 19045.7846 and Windows 10 Enterprise LTSC 2021 to build 19044.7846. Microsoft no longer introduces new features for Windows 10, focusing instead on security and stability improvements.

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Timeline

2026-11-10
Windows 10 KB5131096 released
Microsoft released an extended security update addressing 1,235 vulnerabilities, including a zero-day flaw in Outlook.
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Common questions

Which Windows versions are affected?
The update is applicable to Windows 10 Enterprise LTSC and users enrolled in the ESU program.
What vulnerabilities does this update address?
The update addresses 1,235 vulnerabilities, including a critical zero-day flaw in Outlook.
How can I install the update?
Users can install the update by going to Settings, selecting Windows Update, and running 'Check for Updates'.