Find notable cyber news and cases, enriched with sources, timelines, and signals.

Microsoft Windows Update certificate-rotation guidance

Advisory/Mitigation
First reported
Last updated
Happening score
H score 26
1 unique sources, 1 articles

Summary

Hide ▲

Microsoft told administrators to upgrade supported Windows versions before the Windows Update certificate rotation in May and June 2027. Unsupported devices will lose access to Windows Update services and stop receiving security updates. Microsoft also set version-specific deadlines for Windows 11 24H2 / Windows Server 2025, other supported Windows 11, Windows Server 2022, and Windows 10, and Windows Server 2019/2016. Devices updated through WSUS are not affected.

Related Happenings

Windows 10 KB5126657 extended security update

Security Patch Release
H score20 First: 13.10.2026 22:47 Last: 13.10.2026 22:47 Sources 1

About this happening: Microsoft released Windows 10 KB5126657, an extended security update that rolls in October 2026 Patch Tuesday fixes for Windows 10 Enterprise LTSC and ESU-en...

Windows 11 KB5127648 and KB5126653 October 2026 Patch Tuesday updates

Security Patch Release
H score26 First: 13.10.2026 20:49 Last: 13.10.2026 20:49 Sources 1

About this happening: Microsoft shipped mandatory October 2026 Patch Tuesday cumulative updates for Windows 11 across 26H2/25H2/24H2 and 23H2, closing security gaps across hundreds of vul...

Windows 11 24H2 Home and Pro end-of-updates upgrade advisory

Advisory/Mitigation
H score25 First: 19.08.2026 12:10 Last: 19.08.2026 12:10 Sources 1

About this happening: Microsoft told customers that Windows 11 24H2 Home and Pro will reach end of updates on October 13, 2026, leaving affected devices without monthly security and non-s...

Windows 10 KB5120249 cumulative update (August 2026 Patch Tuesday)

Security Patch Release
H score26 First: 11.08.2026 21:26 Last: 11.08.2026 21:26 Sources 1

About this happening: Microsoft released Windows 10 KB5120249 for versions 22H2 and 21H2, making it a mandatory Patch Tuesday update for supported systems. The release fixes security...

Microsoft Windows 10 KB5099539 extended security update

Security Patch Release
H score16 First: 14.07.2026 21:49 Last: 14.07.2026 21:49 Sources 1

About this happening: Microsoft released Windows 10 KB5099539, a security update bundle for Windows 10 ESU that rolls in July 2026 Patch Tuesday fixes for 570 vulnerabilities. The p...

Timeline

  1. 09.10.2026 13:12 2 articles · 4d ago

    Microsoft Windows Update certificate-rotation guidance

    Initial Disclosure

    Microsoft warned that unsupported Windows devices will stop getting updates when the Windows Update certificates expire in 2027. Administrators were told to identify older systems and start upgrade planning before the cutoff.

    Show sources