Microsoft Fixes Record 966 Vulnerabilities and 2 Active Zero-Days in September 2026 Patch Tuesday.
Microsoft Issues Record-Breaking September 2026 Patch Tuesday Resolving 966 Vulnerabilities and 2 Exploited Zero-Days Microsoft has officially released its September 2026 Patch Tuesday security updates, setting an all-time record by resolving 966 vulnerabilities across its software ecosystem. The massive update release includes patches for 105 Critical-severity flaws alongside 2 active Zero-Day vulnerabilities that have already been weaponized in real-world cyberattacks. OS Knowledge Base (KB) Allocation & Critical Flaw Breakdown System administrators can deploy updates using designated Knowledge Base identifiers based on OS build generations: Windows 11 (Versions 25H2 and 24H2): Updated under KB5124008 . Windows 11 (Version 23H2): Updated under KB5122880 . Windows 10 (Version 22H2 & Enterprise LTSC ESU): Updated under KB5122878 . Critical Severity Profile (105 Total): Encompasses 81 Remote Code Execution (RCE) vulnerabilities, 20 Elevation of Privilege (EoP) flaws, ...