June 9, 2026—KB5095051 (OS Build 28000.2269)

This cumulative update for Windows 11, version 26H1 (KB5095051) 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.

Improvements

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

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.

[BitLocker] This update improves the reliability of BitLocker Drive Encryption testing by ensuring that all required files are available for the USB BIOS logo test.

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:

AI Component	Version
Image Search	1.2604.515.0
Content Extraction	1.2604.515.0
Semantic Analysis	1.2604.515.0
Settings Model	1.2604.515.0

Windows 11 servicing stack update (KB5101277)- 28000.2263

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.