Knowledgebase Catalog

September 2026

KB# Last Updated Description
KB5127652 Nov 12, 2026 KB5127652 is a Safe OS Dynamic Update for Windows 11, version 26H1, released October 28, 2026. It targets the Windows Recovery Environment (WinRE) and applies to all editions of Windows 11 version 26H1. It is delivered through Windows Update, Microsoft…
KB5126836 Nov 12, 2026 KB5126836 is the October 13, 2026 Monthly Rollup for Windows Server 2012 R2 under Extended Security Updates, and it is the final security update in that ESU program, which ended October 13, 2026. A Windows 8.1 variant of the same…
KB5127694 Nov 12, 2026 KB5127694 is a cumulative .NET Framework 3.5 and 4.8.1 security update for Windows 11, version 26H2, released October 13, 2026. It addresses a batch of .NET Framework CVEs. It requires .NET Framework 3.5 or 4.8.1 to already be present, and…
KB5131096 Nov 12, 2026 KB5131096 is a monthly cumulative update for Windows 10 version 22H2 and 21H2, released November 10, 2026. It brings these editions to OS builds 19045.7846 and 19044.7846. It applies to Windows 10 devices on the standard servicing channel, including those…
KB5127688 Nov 12, 2026 KB5127688 is the October 13, 2026 Security and Quality Rollup for .NET Framework 4.8 on Windows Server 2012 R2. It requires .NET Framework 4.8 and is delivered as an Extended Security Update (ESU) for a server that is past end…
KB5130035 Nov 12, 2026 KB5130035 is a cumulative .NET 9.0 security update that delivers .NET 9.0.21, released October 13, 2026. It applies to Windows client and server systems that have .NET 9.0 installed, and it is offered through Windows Update, WSUS, and the Microsoft…
KB5128977 Nov 12, 2026 KB5128977 is a Setup Dynamic Update for Windows 11 versions 25H2 and 26H2, dated October 28, 2026. It patches security vulnerabilities in Windows setup binaries and the files setup uses during feature updates. It applies to all editions of both…
KB5134125 Nov 12, 2026 KB5134125 is an out-of-band cumulative update for Windows 10 version 22H2 (build 19045.7811) and version 21H2 (build 19044.7811), released October 26, 2026. It ships outside the regular monthly update cycle and arrives 13 days after KB5126657.
KB5127936 Nov 12, 2026 KB5127936 is a 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 servicing stack update (KB5132402) and rolls out in two phases, with some features arriving…
KB5130881 Nov 12, 2026 KB5130881 is a Safe OS Dynamic Update that improves the Windows Recovery Environment (WinRE) on Windows 11 versions 25H2 and 26H2, all editions. It was released October 28, 2026 and is delivered through Windows Update, Microsoft Update Catalog, and WSUS.…
KB5127356 Nov 12, 2026 KB5127356 is a servicing stack update (SSU) for Windows Server 2012 R2 with ESU coverage, released October 13, 2026. It makes quality improvements to the component that installs Windows updates. It replaces the earlier KB5123499 and is delivered through Windows…
KB5135582 Nov 12, 2026 KB5135582 is a non-security, out-of-band cumulative update for Windows Server 2012 R2 and Windows 8.1, released November 6, 2026. It is offered as an exception for devices past Year 3 of the Extended Security Updates program, which ended October 13,…
KB5131094 Nov 12, 2026 KB5131094 is a Safe OS Dynamic Update for Windows 10 version 1809 and Windows Server 2019 (LTSC 2019), released November 10, 2026. It targets the Windows Recovery Environment (WinRE) and is distributed only through the Microsoft Update Catalog, WSUS, or…
KB5135883 Nov 12, 2026 KB5135883 is a Setup Dynamic Update for Windows Server 2025, released November 10, 2026. It applies to Windows Server 2025 systems and targets the Windows setup components used during feature upgrades. It requires no prerequisites and no restart, and it…
KB5127653 Nov 12, 2026 KB5127653 is an optional preview cumulative update for Windows 11, version 26H1, released October 28, 2026 as OS Build 28000.3365. It applies to all editions of Windows 11 26H1 and rolls out in both gradual and normal phases. It is…
KB5126835 Nov 12, 2026 KB5126835 is the October 13, 2026 cumulative Monthly Rollup for Windows Server 2012 under Extended Security Updates. It is the final security update for Windows Server 2012 under the ESU program, which ended October 13, 2026. It applies only to…
KB5134137 Nov 12, 2026 KB5134137 is a non-security out-of-band cumulative update for Windows Server 2025 (OS Build 26100.33674), released October 26, 2026. It targets devices that cannot receive automatic certificate trust list updates, such as disconnected environments and systems with CTL updates disabled. It…
KB5127689 Nov 12, 2026 KB5127689 is a cumulative security update for .NET Framework 3.5 and 4.8.1, released October 13, 2026. It applies to Windows 10 Version 21H2 and Windows 10 Version 22H2 and requires .NET Framework 3.5 or 4.8.1 to already be installed. A…
KB5127683 Nov 12, 2026 KB5127683 is the October 13, 2026 cumulative update for .NET Framework 3.5 and 4.8 on Windows 10 Version 21H2 and 22H2. It is a security-focused release that addresses 19 CVEs. It requires .NET Framework 3.5 or 4.8 to already be…
KB5131097 Nov 12, 2026 KB5131097 is a Safe OS Dynamic Update for Windows 11, version 23H2, released November 10, 2026. It applies to all editions of Windows 11 23H2 and targets the Windows Recovery Environment (WinRE). It replaces the earlier KB5126666 and sets the…
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