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Windows 10 Security Update Addresses Vulnerabilities Ahead of ESU Deadline

First seen 10 Nov 2026, 20:49 UTC •
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ThreatCluster AI
ThreatCluster •November 10, 2026 at 20:50 UTC
  • •Microsoft released KB5131096 to address security vulnerabilities in Windows 10.
  • •Free support for Windows 10 Enterprise LTSC 2021 ends on January 12, 2027.
  • •Devices not enrolled in the ESU program will not receive critical updates, increasing risk.

On November 10, 2026, Microsoft released a cumulative security update (KB5131096) for Windows 10 versions 21H2 and 22H2, addressing multiple security issues. This update is crucial as free support for Windows 10 Enterprise LTSC 2021 will end on January 12, 2027, and devices running version 22H2 require an Extended Security Updates (ESU) Year 2 license to continue receiving updates. The update includes fixes from previous out-of-band updates and addresses daylight saving time adjustments for Cuba. The ESU program is designed to protect eligible Windows 10 PCs during the transition to Windows 11, providing critical and important security updates. However, devices not enrolled in the ESU program will not receive these updates, increasing their vulnerability to cyber threats. The updates are essential for maintaining security as devices become more exposed without regular support.

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Timeline

2026-10-13
Previous updates released
Microsoft released KB5126657 addressing security issues for Windows 10 versions 21H2 and 22H2.
support.microsoft.com
2026-10-26
Out-of-band updates released
Microsoft released KB5134125 as an out-of-band update for Windows 10 addressing critical vulnerabilities.
support.microsoft.com
2026-11-10
KB5131096 security update released
Microsoft released a cumulative security update for Windows 10 versions 21H2 and 22H2, addressing multiple vulnerabilities.
support.microsoft.com

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Common questions

What versions are affected by the update?
The update applies to Windows 10 versions 21H2 and 22H2.
What happens if I don't enroll in the ESU program?
Devices not enrolled in the ESU program will not receive critical security updates, increasing their vulnerability.
When does free support for Windows 10 Enterprise LTSC 2021 end?
Free support ends on January 12, 2027.