Knowledgebase Catalog

April 2026

KB# Last Updated Description
KB5128977 Nov 07, 2026 KB5128977 is a Setup Dynamic Update for Windows 11, versions 25H2 and 26H2, dated October 28, 2026. It applies to all editions of both versions and is delivered through Windows Update, WSUS (Update classification), and the Microsoft Update Catalog. It…
KB5126664 Nov 07, 2026 KB5126664 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 KB5122886. It is available only through the Microsoft Update Catalog, and…
KB5127652 Nov 07, 2026 KB5127652 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) only. Per Microsoft's support page, it supersedes KB5127651, and the…
KB5129651 Nov 07, 2026 KB5129651 is a Setup Dynamic Update for Windows 11, version 26H1, dated October 28, 2026, applying to all editions of that version. It targets the setup binaries and related files used during feature updates. It requires Windows 11 26H1 to…
KB5127653 Nov 07, 2026 KB5127653 is an optional non-security preview cumulative update for Windows 11, version 26H1 (OS Build 28000.3365), dated October 28, 2026. It applies to all editions of 26H1, and Microsoft's page notes it rolls out in gradual and normal phases. Neowin…
KB5127683 Nov 07, 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 requires .NET Framework 3.5 or 4.8 to already be installed. It is delivered through Windows Update, Windows Update…
KB5126665 Nov 07, 2026 KB5126665 is a Safe OS Dynamic Update for the Windows Recovery Environment (WinRE) on Windows 10 versions 21H2 and 22H2, including Enterprise LTSC 2021 and ESU-enrolled devices. Microsoft lists its release date as October 13, 2026. It is offered as…
KB5135580 Nov 07, 2026 KB5135580 is a non-security, out-of-band cumulative update for Windows Server 2012, released November 6, 2026. It is the final update provided through the Windows Server 2012 Extended Security Updates (ESU) program, which ended October 13, 2026. It is available only…
KB5127936 Nov 07, 2026 KB5127936 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 rolls out in two phases: gradual, then normal. It also bundles AI component updates that…
KB5134134 Nov 07, 2026 KB5134134 is a non-security out-of-band cumulative update for Windows 11, version 26H1 (OS Build 28000.3237), released October 26, 2026. It targets all editions and is aimed mainly at devices that cannot receive current certificate trust list (CTL) updates, such as…
KB5135582 Nov 07, 2026 KB5135582 is a non-security out-of-band cumulative update for Windows Server 2012 R2, released November 6, 2026. It targets devices in Year 3+ of the Extended Security Updates program, which ended October 13, 2026. It rolls up the October 13, 2026…
KB5127687 Nov 07, 2026 KB5127687 is a cumulative security update for .NET Framework 3.5 and 4.8 on Windows Server 2022, released October 13, 2026. It addresses 18 CVEs and includes no quality or reliability changes. It requires .NET Framework 3.5 or 4.8 to already…
KB5127649 Nov 07, 2026 KB5127649 is a Setup Dynamic Update for Windows 11, version 26H1, released October 13, 2026. It applies to all editions of Windows 11 26H1 and requires that version to already be installed. It replaces the previously released KB5128941.
KB5126660 Nov 07, 2026 KB5126660 is a Safe OS Dynamic Update for Windows Server 2025, dated October 13, 2026, that improves the Windows Recovery Environment (WinRE). It applies only to Windows Server 2025. It replaces the earlier KB5122883. Microsoft lists no prerequisites, and no…
KB5128927 Nov 07, 2026 KB5128927 is a Security and Quality Rollup for .NET Framework 3.5, 4.6.2, 4.7, 4.7.1, 4.7.2, and 4.8 on Windows Server 2012 R2, dated October 13, 2026. It is a monthly cumulative update that bundles fixes for the individual .NET Framework…
KB5134133 Nov 07, 2026 KB5134133 is a non-security out-of-band cumulative update released October 26, 2026, for Windows 11 24H2, 25H2, and 26H2 (builds 26100.9725, 26200.9725, and 26300.9725). Microsoft aimed it at devices that don't receive automatic certificate trust list (CTL) updates, such as disconnected…
KB5127646 Nov 07, 2026 KB5127646 is the October 13, 2026 cumulative update for Windows 11, version 26H1 (OS Build 28000.3231), applying to all editions. It bundles the September 2026 preview and out-of-band fixes and includes servicing stack update KB5127645 (Build 28000.3225). The page includes…
KB5127650 Nov 07, 2026 KB5127650 is a Setup Dynamic Update for Windows 11 versions 24H2, 25H2, and 26H2, published October 13, 2026. It applies to all editions of those versions. It replaces the earlier KB5127216.
KB5127359 Nov 07, 2026 KB5127359 is a Setup Dynamic Update for Windows Server 2025, dated October 13, 2026. It addresses security vulnerabilities in Windows setup binaries and related files used during feature updates. It applies only to Windows Server 2025 and supersedes KB5126027. No…
KB5127363 Nov 07, 2026 KB5127363 is a Setup Dynamic Update for Windows 11, version 23H2 (all editions), dated October 13, 2026. It updates the setup binaries and related files used during feature updates. It needs no prerequisites and no restart, and it replaces KB5126030.…
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