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
KB5077800 (OS Build 20348.4650): Windows Server 2022 Out-of-Band Update - January 17, 2026
Out-of-band cumulative update for Windows Server 2022, releasing January 17, 2026, at OS build 20348.4650. Fixes Remote Desktop sign-in failures introduced by the January 2026 security update.
KB5073722 - Windows Server 2016 / Windows 10 LTSB 2016 Security Update (January 13, 2026)
KB5073722 is the January 13, 2026 cumulative security update for Windows Server 2016 and Windows 10 Enterprise LTSB 2016, bringing OS Build 14393.8783.
KB5073723: January 13, 2026 Security Update for Windows Server 2019 and Windows 10 LTSC 2019 (OS Build 17763.8276)
Security update for Windows Server 2019 and Windows 10 Enterprise LTSC 2019, bringing OS build to 17763.8276. Released January 13, 2026.
KB5073379 - Windows Server 2025 Security Update (OS Build 26100.32230)
January 13, 2026 cumulative security update for Windows Server 2025, delivering OS build 26100.32230 with security fixes, quality improvements, and a bundled servicing stack update.
KB5073455: Windows 11 version 23H2 Security Update (OS Build 22631.6491) - January 2026
January 13, 2026 cumulative security update for Windows 11 version 23H2, delivering OS build 22631.6491 with security fixes, quality improvements, and credential autofill hardening.
KB5073724: Windows 10 January 13 2026 Security Update (OS Builds 19045.6809 and 19044.6809)
January 13 2026 security update for Windows 10 version 22H2 and LTSC 2021, delivering OS builds 19045.6809 and 19044.6809 with security fixes and quality improvements.
KB5073457: Windows Server 2022 Security Update (OS Build 20348.4648) - January 2026
January 2026 cumulative security update for Windows Server 2022, delivering OS build 20348.4648 with security fixes, quality improvements, and four known issues.
KB5074109 - Windows 11 versions 25H2 and 24H2 Security Update (January 13, 2026)
KB5074109 is the January 13, 2026 cumulative security update for Windows 11 versions 25H2 and 24H2, delivering OS builds 26200.7623 and 26100.7623.
KB5074974 (OS Build 14393.8692) Out-of-Band Update for Windows Server 2016 and Windows 10 LTSB 2016
Out-of-band update released December 18, 2025 for Windows Server 2016 and Windows 10 LTSB 2016, fixing an MSMQ regression introduced by the December 9, 2025 update.
KB5074975 (OS Build 17763.8148) Out-of-Band Update for Windows 10 LTSC 2019 and Server 2019
Out-of-band update released December 18, 2025, fixing an MSMQ regression introduced by the December 9, 2025 updates on OS Build 17763.8148.
KB5074976: Windows 10 Out-of-Band Update - OS Builds 19044.6693 and 19045.6693 (December 18, 2025)
Out-of-band update for Windows 10 (builds 19044.6693 and 19045.6693) released December 18, 2025, fixing an MSMQ regression introduced by the December 9, 2025 updates.
KB5071543: December 9, 2025 Security Update for Windows Server 2016 and Windows 10 LTSB 2016 (OS Build 14393.8688)
Security update released December 9, 2025 for Windows Server 2016 and Windows 10 Enterprise LTSB 2016, bringing OS build to 14393.8688 with a PowerShell 5.1 fix.
KB5071544 - Windows Server 2019 / Win 10 LTSC 2019 Security Update (OS Build 17763.8146)
December 9, 2025 security update for Windows Server 2019 and Windows 10 Enterprise LTSC 2019, bringing OS build 17763.8146 with quality fixes and a PowerShell 5.1 security change.
December 9, 2025 - KB5071546 (OS Builds 19045.6691 and 19044.6691)
Security update for Windows 10 ESU and Windows 10 Enterprise LTSC 2021, releasing OS builds 19045.6691 and 19044.6691 on December 9, 2025.
KB5071417: Windows 11 23H2 Cumulative Update - December 9, 2025 (OS Build 22631.6345)
December 9, 2025 security cumulative update for Windows 11 version 23H2, delivering OS build 22631.6345 with security fixes and a PowerShell 5.1 improvement.
December 9, 2025 Hotpatch KB5071413 - Windows Server 2022 OS Build 20348.4467
Hotpatch KB5071413 delivers security and quality improvements to Windows Server 2022 Datacenter: Azure Edition, bringing the OS to build 20348.4467 on December 9, 2025.
KB5071547: Windows Server 2022 Cumulative Update (OS Build 20348.4529) - December 2025
December 9, 2025 security cumulative update for Windows Server 2022, bringing OS build 20348.4529 with security fixes, quality improvements, and a known WSUS issue.
KB5072033: Windows 11 Security Update for Builds 26200.7462 and 26100.7462 (December 2025)
December 9, 2025 cumulative security update for Windows 11 versions 25H2 and 24H2, delivering OS builds 26200.7462 and 26100.7462 with security fixes and quality improvements.
December 9, 2025 Hotpatch KB5072014 (OS Build 26100.7392) for Windows Server 2025
Hotpatch KB5072014 delivers security improvements to Windows Server 2025 Datacenter and Standard machines on Azure Arc at OS Build 26100.7392, released December 9, 2025.
KB5070311: Windows 11 OS Builds 26200.7309 and 26100.7309 Preview (December 2025)
Optional non-security preview update for Windows 11 versions 25H2 and 24H2, releasing December 1, 2025, with improvements to File Explorer, keyboard layouts, gaming, and more.