September 14, 2026—KB5129238 (OS Build 17763.9247) Out-of-band

September 14, 2026—KB5129238 OS Build 17763.9247 Out-of-band Applies To Win 10 Ent LTSC 2019 Windows Server 2019 Summary This article lists the security issues and quality improvements included in this out-of-band update. Windows Server 2019 Windows 10, version 1809 Applies to: Windows Server 201...

September 14, 2026—KB5129236 (OS Builds 19045.7727 and 19044.7727) Out-of-band

September 14, 2026—KB5129236 OS Builds 19045.7727 and 19044.7727 Out-of-band Applies To Windows 10 ESU Windows 10 Enterprise LTSC 2021 Important Free support for Windows 10 Enterprise LTSC 2021 will end soon. For information about the availability of an Extended Security Update ESU, see the End o...

September 14, 2026—KB5129235 (OS Build 26100.33451) Out-of-band

September 14, 2026—KB5129235 OS Build 26100.33451 Out-of-band Applies To Windows Server 2025, all editions This out-of-band OOB update for Windows Server 2025 KB5129235 is a non-security cumulative update. Improvements This out-of-band update contains quality improvements from KB5122871 released...

September 14, 2026—KB5129242 (OS Build 22631.7584) Out-of-band

September 14, 2026—KB5129242 OS Build 22631.7584 Out-of-band Applies To Windows 11 version 23H2, all editions This out-of-band update for Windows 11, version 23H2 KB5129242 is cumulative. It includes updates from previous security releases, along with additional improvements. Visit the Windows...