August 27, 2026—KB5120998 (OS Builds 26200.9278 and 26100.9278) Preview

August 27, 2026—KB5120998 OS Builds 26200.9278 and 26100.9278 Preview Applies To Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions This cumulative update for Windows 11, version 25H2 and 24H2 KB5120998, includes production-quality improvements. Announcements and messages...

Authorization Bypass Through User-Controlled Key

Overview Affected versions of this package are vulnerable to Authorization Bypass Through User-Controlled Key via the preview and update actions in the backend account management process. An attacker can access sensitive profile information of other backend users by supplying arbitrary user IDs i...

April 30, 2026—KB5083806 (OS Build 28000.1896) Preview

April 30, 2026—KB5083806 OS Build 28000.1896 Preview Applies To Windows 11 version 26H1, all editions This non-security update for Windows 11, version 26H1 KB5083806, includes production-quality improvements. To learn more about differences between security updates, optional non-security preview...

March 26, 2026—KB5079391 (OS Builds 26200.8116 and 26100.8116) Preview

March 26, 2026—KB5079391 OS Builds 26200.8116 and 26100.8116 Preview Applies To Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions Note This update is no longer being offered to new devices due to an installation issue identified after release. The issue has been addresse...

December 1, 2025—KB5070311 (OS Builds 26200.7309 and 26100.7309) Preview

December 1, 2025—KB5070311 OS Builds 26200.7309 and 26100.7309 Preview Applies To Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions This non-security update for Windows 11, version 25H2 and 24H2 KB5070311, improves functionality, performance, and reliability. To learn mo...

October 28, 2025—KB5067112 (OS Build 22631.6133) Preview

October 28, 2025—KB5067112 OS Build 22631.6133 Preview Applies To Windows 11 version 23H2, all editions This non-security update for Windows 11, version 23H2 KB5067112, improves functionality, performance, and reliability. To learn more about differences between security updates, optional...

July 22, 2025—KB5062649 (OS Build 19045.6159) Preview

July 22, 2025—KB5062649 OS Build 19045.6159 Preview Applies To Windows 10 Home and Pro, version 22H2 Windows 10 Enterprise Multi-Session, version 22H2 Windows 10 Enterprise and Education, version 22H2 Windows 10 IoT Enterprise, version 22H2 Windows Secure Boot certificate expiration Important:...

September 26, 2024—KB5043145 (OS Builds 22621.4249 and 22631.4249) Preview

September 26, 2024—KB5043145 OS Builds 22621.4249 and 22631.4249 Preview Applies To Windows 11 Enterprise and Education, version 22H2 Windows 11 version 23H2, all editions Note 07/09/24---END OF SERVICE NOTICE --- IMPORTANT Home and Pro editions of Windows 11, version 22H2 will reach end of...

January 23, 2024—KB5034204 (OS Builds 22621.3085 and 22631.3085) Preview

January 23, 2024—KB5034204 OS Builds 22621.3085 and 22631.3085 Preview Applies To Windows 11 version 22H2, all editions Windows 11 version 23H2, all editions Note UPDATED 2/27/24 IMPORTANT: New dates for the end of non-security updates for Windows 11, version 22H2 The new end date is June 24, 202...

October 31, 2023—KB5031455 (OS Builds 22621.2506 and 22631.2506) Preview

October 31, 2023—KB5031455 OS Builds 22621.2506 and 22631.2506 Preview Applies To Windows 11 version 22H2, all editions Windows 11 version 23H2, all editions Note For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update...

November 22, 2022—KB5020032 (OS Build 20348.1311) Preview

November 22, 2022—KB5020032 OS Build 20348.1311 Preview Applies To Windows Server 2022 Note NEW 12/22/22 IMPORTANT After November 22, 2022, there are no more optional, non-security preview releases for Windows Server 2022. Only cumulative monthly security updates known as the "B" or Update Tuesda...

October 25, 2022—KB5018496 (OS Build 22621.755) Preview

October 25, 2022—KB5018496 OS Build 22621.755 Preview Applies To Windows 11 version 22H2, all editions Note For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Windows 11, version 22H2, see i...

September 20, 2022-KB5017859 Cumulative Update Preview for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11

September 20, 2022-KB5017859 Cumulative Update Preview for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 11 Applies To .NET Note Release Date: September 20, 2022 Version: .NET Framework 3.5, 4.8 and 4.8.1 Summary This article describes the Cumulative Update for 3.5, 4.8 and 4.8.1 for Windows 11...

September 20, 2022-KB5017860 Cumulative Update Preview for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2

September 20, 2022-KB5017860 Cumulative Update Preview for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2 Applies To .NET Note Release Date: September 20, 2022 Version: .NET Framework 3.5, 4.8 and 4.8.1 Summary This article describes the Cumulative Update for...

September 20, 2022—KB5017379 (OS Build 17763.3469) Preview

September 20, 2022—KB5017379 OS Build 17763.3469 Preview Applies To Win 10 Ent LTSC 2019 Win 10 IoT Ent LTSC 2019 Windows 10 IoT Core LTSC Windows Server 2019 Note REMINDER 9/20/22 After today, September 20, 2022, there will no longer be optional, non-security releases known as "C" or preview...

August 23, 2022—KB5016690 (OS Build 17763.3346) Preview

August 23, 2022—KB5016690 OS Build 17763.3346 Preview Applies To Win 10 Ent LTSC 2019 Win 10 IoT Ent LTSC 2019 Windows 10 IoT Core LTSC Windows Server 2019 Note 7/12/22 After September 20, 2022, there will no longer be optional, non-security releases known as "C" or preview releases for the 2019...

May 24, 2022 Preview update (KB5014020)

May 24, 2022 Preview update KB5014020 Applies To Azure Local, version 20H2 Note For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Azure Stack HCI, version 20H2, see its update history page...

April 25, 2022—KB5011831 (OS Builds 19042.1682, 19043.1682, and 19044.1682) Preview

April 25, 2022—KB5011831 OS Builds 19042.1682, 19043.1682, and 19044.1682 Preview Applies To Windows 10, version 20H2, all editions Windows Server, version 20H2, all editions Windows 10, version 21H1, all editions Windows 10, version 21H2, all editions Note 3/15/22 IMPORTANT Windows 10, version...

February 15, 2022 Preview update (KB5010428)

February 15, 2022 Preview update KB5010428 Applies To Azure Local, version 20H2 Note For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Azure Stack HCI, version 20H2, see its update history...

January 27, 2022 Preview update (KB5009625)

January 27, 2022 Preview update KB5009625 Applies To Azure Local, version 20H2 Note For information about Windows update terminology, see the article about the types of Windows updates and the monthly quality update types. For an overview of Azure Stack HCI, version 20H2, see its update history...