Microsoft Support:
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:
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.
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 updateMicrosoft 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.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.Available | Next Step |
|---|---|
| This update downloads and installs automatically from Windows Update and Microsoft Update. |
|
| To install this release from the Microsoft Update Catalog, follow these instructions: |
File information
For a list of the files provided in this update, download the file information for cumulative update 5095051.For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5101277) - version 28000.2263.
Source:
June 9, 2026—KB5095051 (OS Build 28000.2269) - Microsoft Support
support.microsoft.com
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UUP Dump - Download Windows Insider ISO
UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...
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