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Microsoft September 2026 Patch Tuesday security updates (966 flaws)

Security Patch Release
First reported
Last updated
Happening score
H score 54
4 unique sources, 4 articles

Summary

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Microsoft released its September 2026 Patch Tuesday updates for a record 966 flaws, including two actively exploited zero-days that can enable local SYSTEM privilege escalation on affected systems.

Related Happenings

Windows 10 KB5120249 cumulative update (August 2026 Patch Tuesday)

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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...

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Microsoft Windows 10 KB5099539 extended security update

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H score16 First: 14.07.2026 21:49 Last: 14.07.2026 21:49 Sources 1

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Microsoft YellowKey patch release (CVE-2026-45585)

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H score20 First: 11.06.2026 20:43 Last: 11.06.2026 20:43 Sources 1

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Microsoft June 2026 Patch Tuesday record 206-vulnerability update

Security Patch Release
H score55 First: 10.06.2026 12:38 Last: 10.06.2026 12:38 Sources 1

About this happening: Microsoft shipped a record 206-vulnerability update for its software portfolio, including three publicly disclosed flaws. The release spans Critical and Important...

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Microsoft June 2026 Patch Tuesday GreenPlasma and YellowKey fixes

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H score15 First: 10.06.2026 02:11 Last: 10.06.2026 02:11 Sources 1

About this happening: Microsoft released June 2026 Patch Tuesday updates that fixed the GreenPlasma and YellowKey flaws, closing two previously disclosed issues in the Windows ecosystem...

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Timeline

  1. 08.09.2026 21:18 3 articles · 15h ago

    Microsoft releases September 2026 Patch Tuesday for 966 flaws

    Initial Disclosure

    Microsoft released September 2026 Patch Tuesday security updates for a record 966 flaws, marking its largest security update ever and including 105 Critical vulnerabilities across multiple product families.

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  2. 08.09.2026 21:18 3 articles · 15h ago

    Microsoft patches two actively exploited Windows zero-days that enable SYSTEM privileges

    Technical Analysis Update

    Microsoft patched CVE-2026-81963 in the Windows Update Stack and CVE-2026-85880 in Windows Advanced Local Procedure Call (ALPC). Both flaws were actively exploited and can let an authorized attacker elevate privileges locally to SYSTEM, but no exploitation details were shared.

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