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.
21articles
15security updates
3product lines
21 articles
out of bandKB5078167: Windows 11 25H2 and 24H2 January 24, 2026 Hotpatch Out-of-Band (OS Builds 26200.7634 and 26100.7634)Out-of-band hotpatch for Windows 11 25H2 and 24H2 released January 24, 2026, fixing Remote Desktop failures and cloud file system errors.out of bandKB5084597: 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.out of bandKB5084897: 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.out of bandKB5085518: Windows 11 versions 25H2 and 24H2 March 23, 2026 Hotpatch (OS Builds 26200.7985 and 26100.7985) Out-of-bandOut-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.dynamicKB5094156: Safe OS Dynamic Update for Windows 11, version 23H2 (June 9, 2026)Safe OS Dynamic Update for Windows 11 version 23H2, released June 9, 2026. Improves the Windows Recovery Environment (WinRE) to version 10.0.22621.7219.securityKB5093998: Windows 11 version 23H2 June 2026 Patch Tuesday update (OS Build 22631.7219)Monthly security cumulative update for Windows 11 version 23H2, releasing OS build 22631.7219 on June 9, 2026.securityKB5094126: Windows 11 versions 25H2 and 24H2 June 2026 Patch Tuesday update (OS Builds 26200.8655 and 26100.8655)Monthly security cumulative update for Windows 11 versions 25H2 and 24H2, releasing OS builds 26200.8655 and 26100.8655 on June 9, 2026.securityKB5094122 - Windows Server 2016 / Windows 10 1607 Security Update (OS Build 14393.9234)Cumulative security update for Windows Server 2016 and Windows 10 version 1607, releasing OS build 14393.9234 on June 9, 2026.securityJune 9, 2026 - KB5094123 (OS Build 17763.8880) Security UpdateCumulative security update for Windows Server 2019 and Windows 10 Enterprise LTSC 2019, releasing OS Build 17763.8880 on June 9, 2026.securityKB5094125: Windows Server 2025 June 2026 Cumulative Update (OS Build 26100.32995)June 9, 2026 security cumulative update for Windows Server 2025, delivering OS build 26100.32995 with security fixes, Secure Boot improvements, DNS over HTTPS, and File Explorer search enhancements.securityKB5094128: Windows Server 2022 June 2026 Security Update (OS Build 20348.5256)KB5094128 is the June 9, 2026 cumulative security update for Windows Server 2022, bringing OS build to 20348.5256 with security fixes and quality improvements.securityKB5095051: Windows 11 version 26H1 June 2026 Cumulative Update (OS Build 28000.2269)June 9, 2026 security cumulative update for Windows 11 version 26H1, delivering OS build 28000.2269 with security fixes, BitLocker improvements, and folder customization hardening.securityKB5094127: Windows 10 June 2026 Patch Tuesday update (OS Builds 19045.7417 and 19044.7417)June 2026 cumulative security update for Windows 10 22H2 and 21H2 LTSC, delivering OS builds 19045.7417 and 19044.7417 with security fixes and quality improvements.securityKB5087420: Windows 11 version 23H2 Security Update (OS Build 22631.7079) - May 2026May 12, 2026 cumulative security update for Windows 11 version 23H2, bringing OS build 22631.7079 with Secure Boot, SmartScreen, and Remote Desktop fixes.securityKB5087539 - Windows Server 2025 Security Update (OS Build 26100.32860)May 12, 2026 cumulative security update for Windows Server 2025, bringing OS build 26100.32860 with Secure Boot, connectivity, and AD CS improvements.securityKB5089548: Windows 11 Version 26H1 May 2026 Security Update (OS Build 28000.2113)KB5089548 is the May 12, 2026 Patch Tuesday cumulative security update for Windows 11 version 26H1, bringing devices to OS Build 28000.2113.securityKB5089466: Windows 11 May 2026 Hotpatch (OS Builds 26200.8390 and 26100.8390)May 12, 2026 hotpatch security update for Windows 11 Enterprise LTSC 2024, versions 25H2 and 24H2, delivering OS builds 26200.8390 and 26100.8390.securityKB5089549: Windows 11 May 2026 Cumulative Update (OS Builds 26200.8457 and 26100.8457)May 12, 2026 cumulative security update for Windows 11 versions 25H2 and 24H2, delivering OS builds 26200.8457 and 26100.8457 with security fixes and quality improvements.securityKB5087537: Windows Server 2016 / Windows 10 LTSB 2016 May 2026 Update (OS Build 14393.9140)May 12, 2026 cumulative security update for Windows Server 2016 and Windows 10 LTSB 2016, delivering OS build 14393.9140 with security fixes and quality improvements.out of bandKB5091157: Windows Server 2025 April 19 2026 Out-of-Band Update (OS Build 26100.32698)Non-security out-of-band cumulative update for Windows Server 2025 fixing a domain controller LSASS crash affecting PAM in multi-domain forests. Released April 19, 2026.securityApril 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.