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
KB5051987: Windows 11 version 24H2 Security Update (OS Build 26100.3194) - February 2025
February 11, 2025 cumulative security update for Windows 11 version 24H2, delivering OS Build 26100.3194 with miscellaneous internal security improvements.
KB5051989: Windows 11 Security Update - OS Builds 22621.4890 and 22631.4890 (February 2025)
February 11, 2025 security update for Windows 11 versions 22H2 and 23H2, bringing OS builds to 22621.4890 and 22631.4890 with a Hyper-V backup fix and bundled SSU.
KB5052106: Windows Server 2022 Datacenter Azure Edition February 2025 Hotpatch (OS Build 20348.3148)
KB5052106 is the February 11, 2025 cumulative security hotpatch for Windows Server 2022 Datacenter: Azure Edition and Azure Stack HCI 21H2, producing OS build 20348.3148.
KB5051979: Windows Server 2022 Security Update (OS Build 20348.3207) - February 2025
February 11, 2025 security update for Windows Server 2022, bringing OS build 20348.3207 with fixes for Task Manager, USB audio, Device Health Attestation, and more.
KB5050092: Windows 11 OS Builds 22621.4830 and 22631.4830 Preview (January 29, 2025)
Optional preview update for Windows 11 22H2 and 23H2 delivering quality improvements, new features, and bug fixes. Released January 29, 2025.
KB5050094: Windows 11 24H2 Preview Update (OS Build 26100.3037) - January 28, 2025
Optional preview update for Windows 11 version 24H2, releasing OS build 26100.3037 on January 28, 2025, with taskbar, File Explorer, mouse, and audio fixes.
KB5050575: Out-of-Box Experience Update for Windows 11 24H2 and Windows Server 2025 (January 21, 2025)
KB5050575 improves the Windows 11 version 24H2 and Windows Server 2025 out-of-box experience (OOBE). It installs automatically during OOBE when an internet connection is available.
KB5052819 (OS Build 20348.3095) Out-of-Band Update for Windows Server 2022
Out-of-band quality update for Windows Server 2022 (OS Build 20348.3095) released January 18, 2025, fixing a startup failure on servers with two or more NUMA nodes.
KB5050021: Windows 11 Security Update - OS Builds 22621.4751 and 22631.4751 (January 2025)
January 14, 2025 security update for Windows 11 versions 22H2 and 23H2, bringing OS builds to 22621.4751 and 22631.4751 with kernel driver blocklist and SSU improvements.
KB5049983: Windows Server 2022 Security Update (OS Build 20348.3091) - January 14, 2025
January 14, 2025 security update for Windows Server 2022, delivering OS build 20348.3091 with kernel driver blocklist improvements and a bundled servicing stack update.
KB5050009 - Windows 11 24H2 Security Update (OS Build 26100.2894)
January 14, 2025 security update for Windows 11 version 24H2, delivering OS Build 26100.2894. Addresses kernel vulnerable driver blocklist and includes a bundled servicing stack update.
KB5012170: Security Update for Secure Boot DBX - What Sysadmins Need to Know
KB5012170 adds vulnerable UEFI module signatures to the Secure Boot DBX, blocking known boot loader bypass vulnerabilities on Windows 10, 11, and Server.
KB5033052: Update Stack Package for Windows 10 versions 21H2 and 22H2
KB5033052 is an optional Update Stack Package for Windows 10 21H2 and 22H2 that improves a select set of update-related system files to increase update reliability.
KB5054156: Feature Update to Windows 11 Version 25H2 via Enablement Package
KB5054156 upgrades Windows 11 from version 24H2 to 25H2 using a small enablement package that activates dormant features with a single restart.
Windows Secure Boot Certificate Expiration and CA Updates (KB5062710)
Microsoft is replacing expiring 2011 Secure Boot certificates with 2023 versions to keep Windows devices protected. Affects all Windows 10, Windows 11, and Windows Server editions.
KB5074204: Security Update for Windows PowerShell (OS Builds 26100.7392 and 26200.7392)
A security update for Windows PowerShell targeting hotpatch-enrolled devices running Windows 11 24H2 and 25H2, released December 9, 2025.
Windows Malicious Software Removal Tool (MSRT) KB890830 - June 2026 (v5.142)
The Windows MSRT removes specific prevalent malware from supported Windows versions. Released monthly via Windows Update; June 2026 release is v5.142.