Win Update KB5094126 Windows 11 Cumulative Update build 26100.8655 (24H2) and 26200.8655 (25H2) - June 9

This cumulative update for Windows 11, version 25H2 and 24H2 (KB5094126) 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. Microsoft has been updating these certificates on consumer and non-managed business devices over the past several months. Devices that haven’t received the newer certificates will continue to start and operate normally, and standard Windows updates will continue to install. Updated certificates will continue to be delivered through Windows Update in the coming months.

End of updates​

Windows 11, version 24H2 Home and Pro editions will reach end of updates on October 13, 2026. Devices running these editions will no longer receive fixes for known issues, time zone updates, technical support, or monthly security and preview updates containing protections from the latest security threats. Enterprise and Education editions remain supported until October 12, 2027.

To stay protected and up to date, we recommend you upgrade to the latest version of Windows 11.

Change log​

Improvements​

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

• May 12, 2026—KB5089549 (OS Builds 26200.8457 and 26100.8457)
• May 26, 2026—KB5089573 (OS Builds 26200.8524 and 26100.8524)

This update addresses security vulnerabilities documented in the following guide:

• June 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.
• [Virtualization] Fixed: This update addresses an issue that could result in Stop errors HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) after installing KB5089573 on some devices during system restarts, virtual machine operations, or while running some gaming applications
• [Folder customization] This update introduces a security hardening change to how Windows processes desktop.ini files. As a result, some users might notice missing custom folder icons or localized folder names for content from downloaded or remote locations. Note that access to folders is not affected. For more information, see Custom folder icons or localized folder names might not appear after installing the June 2026 Windows security update.

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 (KB5094135)- 26100.8648​

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​

Microsoft is not currently aware of any issues with 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.

Deployment​

If you deploy dynamic updates such as this update to an existing Windows image, ensure the boot.stl file is included as part of the installation media. Failure to include the file might prevent devices from successfully starting from the installation media and can result in error code 0xc0430001.

Note: The boot.stl file is used during Secure Boot validation and must match the Windows version and architecture of the image you are updating.

To ensure the boot.stl file is included as part of the installation media, do one of the following:

• Use the Update WinPE script to update an existing Windows image. (Recommended)
• Manually copy the boot.stl file from the device Windows\Boot\EFI folder to the corresponding folder on your installation media before deploying the update.

For information about how to apply Dynamic Update packages to existing Windows images, see Update Windows installation media with Dynamic Update.

Install this update​

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

File information​

For a list of the files provided in this update, download the file information for cumulative update 5094126.

For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5094135) - version 26100.8648.





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