Windows 10 KB5120249 cumulative update released with fixes

Microsoft released the Windows 10 KB5120249 cumulative update for versions 22H2 and 21H2 as part of the August 2026 Patch Tuesday. The update addresses security vulnerabilities and bugs, including a fix for File History backup failures to network shares due to invalid credentials and expands the rollout of new Secure Boot certificates. This update is mandatory and improves device security by increasing coverage for Secure Boot certificate deployment. No new issues have been reported with this update so far.

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