KB5089549

May 12, 2026—KB5089549 (OS Builds 26200.8457 and 26100.8457)

Applies To

Windows 11 version 25H2, all editionsWindows 11 version 24H2, all editions

Release Date:

5/12/2026

Version:

OS Builds 26200.8457 and 26100.8457

This cumulative update for Windows 11, version 25H2 and 24H2 (KB5089549) includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release.

Visit the Windows release health dashboard for the latest status on this release.

Announcements and messages

This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.

Windows Secure Boot certificate expiration

Windows Secure Boot certificate expiration

Important: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.

Improvements

This update includes new features and quality improvements that were part of the following update:

• April 14, 2026—KB5083769 (OS Builds 26200.8246 and 26100.8246)

• [April 30, 2026—KB5083631 (OS Builds 26200.8328 and 26100.8328)...