Win Update KB5089549 Windows 11 Cumulative Update build 26100.8457 (24H2) and 26200.8457 (25H2) - May 12

UPDATE 5/26:

May 12, 2026 - KB5089549 (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​

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.

Change log​

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) Preview

This update addresses security vulnerabilities documented in the following guide:

• May 2026 Security Updates

The following summary outlines key quality improvements addressed by this update. The bold text within the brackets indicates the item or area of the change.

• [Secure Boot]
  • With this update, Windows quality updates include additional high confidence device targeting data, increasing coverage of devices eligible to automatically receive new Secure Boot certificates. Devices receive the new certificates only after demonstrating sufficient successful update signals, maintaining a controlled and phased rollout.
  • This update adds a new SecureBoot folder under C:\Windows on eligible devices. The folder contains example scripts intended for organizations with IT professionals who actively manage updates across their device fleet. These scripts can be used to detect Secure Boot certificate update status and automate deployment via a safe rollout mechanism in an Active Directory environment. For more information, see Sample Secure Boot E2E Automation Guide.
• [Boot manager servicing update]
  • This update improves startup reliability after boot file updates, so devices start normally without entering BitLocker recovery.
  • (Known issue) Fixed: This update addresses an issue where some devices might enter BitLocker Recovery after updating boot files on systems with certain Trusted Platform Module (TPM) validation settings, including invalid PCR7 (Platform Configuration Register 7) configurations. This might occur after installing the April 2026 security update (KB5083769).
• [Connectivity] This update improves the reliability of Simple Service Discovery Protocol (SSDP) notifications to help prevent the service from becoming unresponsive.
• [Daylight saving time (DST)] This update supports the 2023 DST change for the Arab Republic of Egypt.

If you've already installed previous updates, your device will download and install only the new updates included in this package.

AI Components​

This release updates the following AI components:

Windows 11 servicing stack update (KB5092762)- 26100.8456​

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.

Known issues in this update​

How to get this update​

Before you install this update

Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates.

Install this update

To install this update, use one of the following Windows and Microsoft release channels.


If you want to remove this update

Before you decide to remove this update, see Understanding the risks: Why you should not uninstall security updates.

To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.

Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.

File information

For a list of the files provided in this update, download the file information for cumulative update 5089549.

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5092762) - version 26100.8456.





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