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KB5129195: what it fixes and who gets it

KB5129195 is a security update from Microsoft's August 2026 release for Windows 11 Version 24H2, Windows 11 Version 25H2.

Microsoft data read
1CVEs fixed
0rated Critical
0already exploited
Yesrestart required

Should you install it?

Yes. It is a routine security update; none of its fixes are rated Critical or reported as exploited. Windows Update installs it automatically on supported home PCs.

If the installation fails or the PC misbehaves afterwards, note the exact error code first: the fix depends on it. We have a guide for this update below.

Security fixes in KB5129195

CVETypeCVSSSeverity
CVE-2026-62721Windows User-Mode Power Service (UMPS) Elevation of Privilege VulnerabilityElevation of Privilege7.8Important

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