Microsoft KB articles
Official Windows update notes, documented: improvements, known issues, and how to get each update, with the KB number, OS build and release date at a glance.
197 articles
April 14, 2026 - KB5083769 (OS Builds 26200.8246 and 26100.8246)
Monthly security cumulative update for Windows 11 versions 25H2 and 24H2, releasing April 14, 2026, with security fixes, Secure Boot improvements, and Remote Desktop hardening.
KB5086672: Windows 11 24H2 and 25H2 Out-of-Band Update (OS Builds 26200.8117 and 26100.8117)
Out-of-band cumulative update for Windows 11 24H2 and 25H2, released March 31, 2026, fixing a setup error (0x80073712) that blocked installation of the March 2026 preview update.
KB5079391: Windows 11 Preview Update - OS Builds 26200.8116 and 26100.8116 (March 26, 2026)
Optional non-security preview update for Windows 11 versions 24H2 and 25H2, released March 26, 2026. No longer offered to new devices; superseded by KB5086672.
KB5079489 - Windows 11 Version 26H1 Preview Update (OS Build 28000.1764)
Optional non-security preview update for Windows 11 version 26H1, released March 26, 2026. Delivers AI features, built-in Sysmon, RSAT for Arm64, and quality improvements.
KB5085518: Windows 11 versions 25H2 and 24H2 March 23, 2026 Hotpatch (OS Builds 26200.7985 and 26100.7985) Out-of-band
Out-of-band hotpatch for Windows 11 versions 25H2 and 24H2 fixing a Microsoft account sign-in failure introduced by updates released on or after March 10, 2026.
KB5085516: Windows 11 Out-of-Band Update (OS Builds 26200.8039 and 26100.8039) - March 21, 2026
Out-of-band cumulative update for Windows 11 versions 25H2 and 24H2, fixing a Microsoft account sign-in failure introduced by the March 10, 2026 update.
KB5084897: Windows 11 versions 25H2 and 24H2 March 16, 2026 Hotpatch Out-of-Band (OS Builds 26200.7984 and 26100.7984)
Out-of-band hotpatch for Windows 11 Enterprise LTSC 2024 (builds 26200.7984 and 26100.7984) fixing a Bluetooth visibility issue. Released March 16, 2026.
KB5084597: Windows 11 25H2/24H2 March 13, 2026 Hotpatch Out-of-Band (OS Builds 26200.7982 and 26100.7982)
Out-of-band hotpatch for Windows 11 25H2 and 24H2 fixing RRAS security vulnerabilities. Installs without a restart on hotpatch-enabled devices.
KB5078883: Windows 11 version 23H2 Security Update (OS Build 22631.6783) - March 2026
March 10, 2026 cumulative security update for Windows 11 version 23H2, bringing OS build to 22631.6783 with security fixes and quality improvements.
March 10, 2026 - KB5078885 (OS Builds 19045.7058 and 19044.7058)
Security update for Windows 10 ESU and Enterprise LTSC 2021, releasing OS builds 19045.7058 and 19044.7058 on March 10, 2026.
KB5079466 - Windows 11 Version 26H1 Security Update (OS Build 28000.1719)
March 2026 cumulative security update for Windows 11 version 26H1, delivering OS build 28000.1719 with Secure Boot, WDAC, and WSIM improvements.
March 10, 2026 - KB5078740 (OS Build 26100.32522) Windows Server 2025
Security cumulative update for Windows Server 2025 (OS Build 26100.32522), released March 10, 2026, including Secure Boot and hardware error reporting fixes.
March 10, 2026 Hotpatch KB5079420 (OS Builds 26200.7979 and 26100.7979)
Hotpatch KB5079420 delivers miscellaneous security improvements to Windows 11 Enterprise LTSC 2024 (builds 26200.7979 and 26100.7979), released March 10, 2026.
KB5079473: Windows 11 versions 25H2 and 24H2 Security Update (March 10, 2026)
March 2026 cumulative security update for Windows 11 versions 25H2 and 24H2, bringing OS builds to 26200.8037 and 26100.8037.
March 10, 2026 - KB5078938 (OS Build 14393.8957) Security Update
Monthly security update for Windows Server 2016, Windows 10 LTSB 2016, and Windows 10 IoT Enterprise 2016 LTSB, releasing OS build 14393.8957.
KB5078766: March 2026 Cumulative Security Update for Windows Server 2022 (OS Build 20348.4893)
March 10, 2026 cumulative security update for Windows Server 2022, bringing OS to build 20348.4893 with security fixes and quality improvements.
KB5078752: March 10, 2026 Security Update for Windows Server 2019 and Windows 10 LTSC 2019 (OS Build 17763.8511)
March 2026 cumulative security update for Windows Server 2019 and Windows 10 Enterprise LTSC 2019, bringing OS build 17763.8511 with quality fixes and Secure Boot improvements.
KB5082314 (OS Build 20348.4776) Out-of-Band Update for Windows Server 2022
Out-of-band cumulative update for Windows Server 2022, released March 2, 2026, fixing a Windows Hello for Business certificate renewal issue in ADFS deployments.
KB5077239 (OS Build 28000.1643) Preview - Windows 11 Version 26H1, February 24 2026
Optional preview update for Windows 11 version 26H1, releasing OS build 28000.1643 on February 24, 2026, with AI feature updates, security tooling, and reliability fixes.
KB5077241: Windows 11 Preview Update - OS Builds 26200.7922 and 26100.7922 (February 2026)
Optional non-security preview update for Windows 11 versions 25H2 and 24H2, released February 24, 2026, delivering new features, fixes, and reliability improvements.