August 11, 2026—KB5121000 (OS Build 28000.2704)

August 11, 2026—KB5121000 OS Build 28000.2704 Applies To Windows 11 version 26H1, all editions This cumulative update for Windows 11, version 26H1 KB5121000 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the...

2026-08 Cumulative Update for Windows 11, version 26H1 for arm64-based Systems (KB5121000) (28000.2704)

2026-08 Cumulative Update for Windows 11, version 26H1 for arm64-based Systems KB5121000 28000.2704...

2026-08 Cumulative Update for Windows 11, version 26H1 for x64-based Systems (KB5121000) (28000.2704)

2026-08 Cumulative Update for Windows 11, version 26H1 for x64-based Systems KB5121000 28000.2704...

2026-08 Cumulative Update for Windows 11, version 26H1 for arm64-based Systems (KB5121000) (28000.2704)

Install this update to resolve issues in Windows. For a complete listing of the issues that are included in this update, see the associated Microsoft Knowledge Base article for more information. After you install this item, you may have to restart your computer...