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KB5099538: what it fixes and who gets it

KB5099538 is a security update from Microsoft's October 2026 release for Windows 10 Version 1809.

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 KB5099538

CVETypeCVSSSeverity
CVE-2026-59116Windows Remote Desktop Security Feature Bypass VulnerabilitySecurity Feature Bypass6.8Important

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