Knowledgebase Catalog

August 2026

KB#Last UpdatedDescription
KB5130035Nov 03, 2026KB5130035 is a .NET 9.0 security update (version 9.0.21) released October 13, 2026, refreshing the .NET 9.0 runtime on supported Windows client and server systems. It is delivered through Microsoft Update, WSUS, and the Microsoft Update Catalog, and only applies…
KB5127357Nov 03, 2026KB5127357 is a servicing stack update (SSU) for Windows Server 2012 Extended Security Updates (ESU), dated October 13, 2026. It makes quality improvements to the component that installs Windows updates. It replaces the previously released KB5123602.
KB5133964Nov 03, 2026KB5133964 is an out-of-band .NET 8.0 security update (version 8.0.33) released October 25, 2026, refreshing the October 13, 2026 security release. It targets Windows client and server systems (x64, x86, ARM64) running .NET 8.0, and is distributed via Microsoft Update,…
KB5126835Nov 03, 2026KB5126835 is the October 13, 2026 Monthly Rollup cumulative update for Windows Server 2012 (ESU). It is described as the final security update delivered through the Windows Server 2012 Extended Security Updates program, which ended October 13, 2026. Affected systems…
KB5134133Nov 03, 2026KB5134133 is a non-security out-of-band cumulative update released October 26, 2026 for Windows 11 versions 24H2, 25H2, and 26H2 (builds 26100.9725, 26200.9725, 26300.9725). It is aimed mainly at devices that cannot reach Microsoft's certificate-update service or have automatic CTL updates…
KB5133965Nov 03, 2026KB5133965 is an out-of-band security refresh for .NET 9.0 (runtime 9.0.22), released October 25, 2026. It applies to Windows client and server systems running .NET 9.0 and is distributed via Microsoft Update, WSUS, and the Microsoft Update Catalog, with x86,…
KB5134140Nov 03, 2026KB5134140 is a non-security out-of-band cumulative update for Windows Server 2022 (OS Build 20348.5773), released October 26, 2026. It targets devices that do not receive current certificate trust list (CTL) updates, such as disconnected environments, systems that cannot reach Microsoft's…
KB5127652Nov 03, 2026KB5127652 is a Safe OS Dynamic Update for Windows 11, version 26H1, released October 28, 2026, applying to all editions of that version. It updates the Windows Recovery Environment (WinRE) and replaces the earlier KB5127651. No restart is required, and…
KB5134137Nov 03, 2026KB5134137 is a non-security out-of-band cumulative update for Windows Server 2025 (OS Build 26100.33674), released October 26, 2026. It is aimed mainly at devices that do not receive automatic certificate trust list (CTL) updates, such as disconnected or restricted environments.…
KB5127646Nov 03, 2026KB5127646 is the October 13, 2026 cumulative update for Windows 11, version 26H1 (OS Build 28000.3231), targeting Arm64 systems. It bundles security fixes and non-security changes from the prior optional preview, and is paired with SSU KB5127645 (build 28000.3225). Microsoft's…
KB5134130Nov 03, 2026KB5134130 is a non-security out-of-band cumulative update for Windows 11, version 23H2 (OS Build 22631.7654), released October 26, 2026. It targets Windows 11 23H2 devices that do not receive current certificate trust list (CTL) updates, such as disconnected environments, devices…
KB5127936Nov 03, 2026KB5127936 is an optional non-security preview cumulative update for Windows 11 versions 25H2 and 26H2, released October 28, 2026 (OS Builds 26300.9818 and 26200.9818). It bundles a large set of UI, accessibility, recovery, and networking changes plus a number of…
KB5127651Nov 03, 2026KB5127651 is a Safe OS Dynamic Update for Windows 11, version 26H1, released October 13, 2026, covering all editions. It targets the Windows Recovery Environment (WinRE) and replaces the earlier KB5124013. The update is delivered via Windows Update, Microsoft Update…
KB5126773Nov 03, 2026KB5126773 is a cumulative security update for Internet Explorer 11 released October 13, 2026. It applies to Windows Server 2012 and Windows Server 2012 R2 systems enrolled in Extended Security Updates. Microsoft describes it as the final security update for…
KB5134124Nov 03, 2026KB5134124 is an out-of-band cumulative update for Windows 10 version 1809 and Windows Server 2019 (OS Build 17763.9378), released October 26, 2026. It is a Windows 10 Enterprise LTSC/Server-class servicing release, so the affected systems are those on that build…
KB5126664Nov 03, 2026KB5126664 is a Safe OS Dynamic Update for Windows 10 version 1809 and Windows Server 2019, dated October 13, 2026. It updates the Windows Recovery Environment (WinRE) and replaces the earlier KB5122886. It is available only through the Microsoft Update…
KB5128977Nov 03, 2026KB5128977 is a Setup Dynamic Update released October 28, 2026 for Windows 11 versions 25H2 and 26H2 (all editions). It addresses security vulnerabilities in Windows setup binaries and related files used during feature updates. It replaces the previously released KB5127216…
KB5126658Nov 03, 2026KB5126658 is a Setup Dynamic Update for Windows Server 2022, dated October 13, 2026. It applies only to Windows Server 2022 and replaces the earlier KB5126031. It is delivered through Windows Update, the Microsoft Update Catalog, and WSUS.
KB5127683Nov 03, 2026KB5127683 is the October 13, 2026 cumulative update for .NET Framework 3.5 and 4.8 on Windows 10 versions 21H2 and 22H2. It is delivered through Windows Update, Windows Update for Business, the Microsoft Update Catalog, and WSUS. The update bundles…
KB5130881Nov 03, 2026KB5130881 is a Safe OS Dynamic Update (WinRE update) for Windows 11 versions 25H2 and 26H2, dated October 28, 2026. It improves the Windows Recovery Environment and replaces the previously released KB5127654. Installation is automatic via Windows Update, requires no…
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