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Windows 10 KB5120249 cumulative update (August 2026 Patch Tuesday)

Security Patch Release
First reported
Last updated
Happening score
H score 26
1 unique sources, 1 articles

Summary

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Microsoft released Windows 10 KB5120249 for versions 22H2 and 21H2, making it a mandatory Patch Tuesday update for supported systems. The release fixes security vulnerabilities and bugs and also addresses a File History backup failure on SMB network shares. It additionally expands rollout of new Secure Boot certificates and moves systems to OS Builds 19045.7663 and 19044.7663 after installation.

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Timeline

  1. 11.08.2026 21:26 2 articles · 13d ago

    Microsoft releases Windows 10 KB5120249 for 22H2 and 21H2

    Initial Disclosure

    Microsoft released the mandatory Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday security updates. The update fixes security vulnerabilities and bugs, resolves a File History backup problem affecting SMB network shares where scheduled backups could fail with an invalid credentials error, expands rollout of new Secure Boot certificates, and updates systems to OS Builds 19045.7663 and 19044.7663 after installation.

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