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
KB5065789: Windows 11 versions 24H2 and 25H2 Preview Update (September 29, 2025)
Optional preview update for Windows 11 versions 24H2 and 25H2, releasing OS builds 26200.6725 and 26100.6725 on September 29, 2025.
KB5065790 (OS Build 22631.5984) Preview - Windows 11 23H2 - September 23, 2025
Optional preview update for Windows 11 version 23H2, OS build 22631.5984, released September 23, 2025. Addresses authentication, browser, display, input, networking, and printer issues.
KB5068221 (OS Build 26100.6588): Windows 11 24H2 Out-of-Band Update, September 22 2025
KB5068221 is an out-of-band cumulative update for Windows 11 version 24H2, releasing OS build 26100.6588. It fixes an App-V double handle closure issue and includes all September 2025 security fixes.
KB5065426 - Windows 11 version 24H2 September 2025 Security Update (OS Build 26100.6584)
September 9, 2025 security update for Windows 11 version 24H2, bringing OS build to 26100.6584. Addresses UAC prompt issues, SMB auditing, input bugs, and a kernel interrupt state problem.
September 2025 Hotpatch KB5065306 for Windows Server 2022 Datacenter: Azure Edition (OS Build 20348.4106)
September 9, 2025 hotpatch security update for Windows Server 2022 Datacenter: Azure Edition, bringing OS Build 20348.4106 and fixing unexpected UAC prompts during MSI repair operations.
KB5065432 - Windows Server 2022 Security Update (OS Build 20348.4171) September 2025
September 9, 2025 cumulative security update for Windows Server 2022, bringing OS to build 20348.4171 with fixes for UAC prompts, IME rendering, CRL performance, and SMB auditing.
September 9, 2025 Hotpatch KB5065474 (OS Build 26100.6508) for Windows Server 2025
Hotpatch KB5065474 releases September 9, 2025 for Windows Server 2025 Datacenter: Azure Edition at OS build 26100.6508, fixing unexpected UAC prompts during MSI repair operations.
KB5065431: Windows 11 Security Update - OS Builds 22621.5909 and 22631.5909 (September 2025)
September 9, 2025 security update for Windows 11 versions 22H2 and 23H2, delivering OS builds 22621.5909 and 22631.5909 with targeted fixes and SMB auditing improvements.
Windows 11 24H2 KB5064081 (OS Build 26100.5074) Preview - August 29, 2025
Optional preview update for Windows 11 version 24H2, releasing OS Build 26100.5074 on August 29, 2025, with quality improvements, AI feature updates, and bug fixes.
KB5064080 (OS Build 22631.5840) Preview - Windows 11 23H2, August 26 2025
Optional preview update for Windows 11 version 23H2, releasing OS build 22631.5840 on August 26, 2025, with quality fixes across File Explorer, networking, input, and more.
KB5066189: Windows 11 Out-of-Band Update Fixes Reset and Recovery Failures (Builds 22621.5771 & 22631.5771)
Out-of-band update for Windows 11 22H2 and 23H2 fixing device reset and recovery failures introduced by the August 2025 security update KB5063874.
KB5063878: Windows 11 24H2 Security Update (OS Build 26100.4946) - August 12, 2025
August 12, 2025 cumulative security update for Windows 11 version 24H2, bringing OS to build 26100.4946 with authentication fixes and AI component updates.
August 12, 2025 Hotpatch KB5063812 for Windows Server 2022 Datacenter: Azure Edition (OS Build 20348.3989)
KB5063812 is a security hotpatch for Windows Server 2022 Datacenter: Azure Edition, releasing OS Build 20348.3989 on August 12, 2025.
KB5063875: Windows 11 Security Update - OS Builds 22621.5768 and 22631.5768 (August 12, 2025)
August 12, 2025 cumulative security update for Windows 11 versions 22H2 and 23H2, delivering OS builds 22621.5768 and 22631.5768.
KB5063880: Windows Server 2022 Security Update (OS Build 20348.4052) - August 12, 2025
August 12, 2025 security update for Windows Server 2022, bringing OS to build 20348.4052. Fixes a Traditional Chinese IME input issue and addresses security vulnerabilities.
August 12, 2025 Hotpatch KB5064010 (OS Build 26100.4851) for Windows Server 2025
August 12, 2025 hotpatch for Windows Server 2025 Datacenter: Azure Edition, delivering miscellaneous OS security improvements at OS Build 26100.4851 without requiring a restart.
KB5062660 (OS Build 26100.4770) Preview - Windows 11 24H2, July 22 2025
Optional preview update for Windows 11 version 24H2 released July 22, 2025, delivering OS build 26100.4770 with quality improvements and new features.
KB5062663 Preview Update for Windows 11 Version 23H2 (OS Build 22631.5699)
Optional preview update released July 22, 2025 for Windows 11 version 23H2, delivering non-security quality fixes including file system, input, networking, printer, and stability improvements.
KB5064489 (OS Build 26100.4656) Out-of-Band Update for Windows 11 24H2 - July 13, 2025
Out-of-band cumulative update for Windows 11 24H2, build 26100.4656, released July 13, 2025. Fixes Azure VM startup failures when VBS is enabled on non-Trusted Launch GE VMs.
KB5062560: Windows 10 v1607 and Server 2016 Security Update - OS Build 14393.8246
July 8, 2025 security update for Windows 10 v1607 and Windows Server 2016, delivering OS build 14393.8246 with security hardening and quality fixes.