Microsoft has issued an out-of-band (OOB) update for Windows 11 versions 25H2 and 24H2, identified as KB5085516, addressing a critical sign-in bug introduced by the March 2026 Patch Tuesday release. The update carries OS builds 26200.8039 and 26100.8039 and was made available on March 21, 2026, outside the regular monthly update cadence. The primary driver […] The post Microsoft Emergency Out-of-Band Update for Windows 11 to Fix Microsoft Account Sign-In Failure appeared first on Cyber Security News.