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...

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...