Microsoft KB Catalog

Trending KBs

KB#Last UpdatedDescription
KB5127686Oct 15, 2026KB5127686 is the October 13, 2026 Security and Quality Rollup for .NET Framework 4.8 on Windows Server 2012, delivered as an Extended Security Update (ESU) since Server 2012 is past end of support. It replaces the earlier KB5126147 and KB5121648…
KB5127664Oct 15, 2026KB5127664 is the October 13, 2026 Security and Quality Rollup for .NET Framework 3.5 on Windows Server 2012 R2, delivered as an Extended Security Update (ESU) since the OS is past end of support. It replaces KB5126148 and KB5121649. Affected…
KB5127649Oct 15, 2026KB5127649 is a Setup Dynamic Update for Windows 11, version 26H1, dated October 13, 2026. It applies to all editions of Windows 11 version 26H1 and requires that version already be installed. It targets security fixes in Windows setup binaries…
KB5128928Oct 15, 2026KB5128928 is a security and cumulative update for .NET Framework 3.5, 4.8, and 4.8.1 on Windows Server 2022, released October 13, 2026. It addresses a large batch of CVEs spanning remote code execution, elevation of privilege, denial of service, spoofing,…
KB5126655Oct 15, 2026KB5126655 is the October 13, 2026 cumulative security update for Windows Server 2022 (OS Build 20348.5761). It bundles security fixes and non-security changes from the September 2026 optional preview and out-of-band update KB5129237, and includes servicing stack update KB5126654 (20348.5739).…
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All KBs

KB#Last UpdatedDescription
KB5122871Oct 15, 2026KB5122871 is the September 8, 2026 cumulative update for Windows Server 2025 (OS Build 26100.33438), delivered alongside servicing stack update KB5122870. It bundles security fixes and non-security improvements from the August 2026 optional preview (KB5120233). Its scope is Windows Server…
KB5126041Oct 15, 2026KB5126041 is a Setup Dynamic Update for Windows 11, version 26H1, released September 8, 2026. It addresses security vulnerabilities in Windows setup binaries and related files used during feature updates. It applies to all editions of Windows 11 version 26H1…
KB5126144Oct 15, 2026KB5126144 is the September 8, 2026 cumulative update for .NET Framework 3.5, 4.7.2, and 4.8 on Windows 10 version 1809 and Windows Server 2019. It is delivered through Windows Update, WSUS (Security Updates classification), and the Microsoft Update Catalog. Microsoft's…
KB5126043Oct 15, 2026KB5126043 is the September 8, 2026 cumulative update for .NET Framework 3.5 and 4.7.2 on Windows 10 version 1809 and Windows Server 2019. It is a security-focused servicing release delivered via Windows Update, Windows Update for Business, the Microsoft Update…
KB5126053Oct 15, 2026KB5126053 is the September 8, 2026 cumulative update for .NET Framework 4.8.1 on Windows 11, version 26H1. It bundles security fixes plus a reliability fix and is delivered via Windows Update, WSUS (Security Updates classification), and the Microsoft Update Catalog.…
KB5122882Oct 15, 2026KB5122882 is the September 8, 2026 cumulative security update for Windows Server 2022 (OS Build 20348.5622), bundling fixes from the August 2026 preview and a servicing stack update (KB5122881, build 20348.5614). It applies to Windows Server 2022 only. Microsoft documents…
KB5126256Oct 15, 2026KB5126256 is the Extended Security Updates (ESU) Licensing Preparation Package for Windows 10, documented on Microsoft's support site. It is a licensing-related package for Windows 10 devices enrolling in the ESU program rather than a standard cumulative update. The crawled…
KB5122887Oct 15, 2026KB5122887 is a Safe OS Dynamic Update for Windows 10 versions 21H2 and 22H2 (including Enterprise LTSC 2021 and Windows 10 ESU), dated September 8, 2026. It targets the Windows Recovery Environment (WinRE), is installed automatically via WinRE update KB5127070,…
KB5122883Oct 15, 2026KB5122883 is a Safe OS Dynamic Update for Windows Server 2025 that improves the Windows Recovery Environment (WinRE). The Microsoft Support page is dated September 8, 2026. It applies only to Windows Server 2025 and requires no prerequisites or restart.…
KB5124008Oct 15, 2026KB5124008 is the September 8, 2026 cumulative security update (OS Builds 26200.9445 and 26100.9445) for Windows 11 versions 24H2 and 25H2, bundled with an SSU (KB5124007). It was later followed by out-of-band and monthly updates that addressed several of its…
KB5129235Oct 15, 2026KB5129235 is an out-of-band (OOB) non-security cumulative update for Windows Server 2025 (OS Build 26100.33451), released September 14, 2026. It follows the September 8, 2026 update (KB5122871) and is intended to correct regressions introduced by it. It also bundles the…
KB5129238Oct 15, 2026KB5129238 is an out-of-band cumulative update for Windows 10 version 1809 and Windows Server 2019 (OS Build 17763.9247), released September 14, 2026. The release page in the crawled data is largely site navigation and the update history index, so specific…
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