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.
Announcements and messages
This section provides key notifications related to this release, including announcements, change logs, and end-of-support notices.Change log
Change date | Change description |
|---|---|
| June 16. 2026 | Known issue added: "Microsoft Office applications might fail to open from certain third-party apps". |
| June 10, 2026 | Update: Folder customization added. |
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.
- [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.
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
Symptoms
Microsoft has received reports of an issue in which certain third-party applications might be unable to launch Microsoft Office applications or open documents after installing the Windows updates released on or after June 9, 2026. This issue affects certain third-party applications that use OLE automation to interact with Microsoft Office applications. In some cases, the Office application or document might fail to open without displaying an error message.
Affected Microsoft Office applications might include Word, Excel, PowerPoint, Access, and other Microsoft Office applications when launched from within the affected third-party application.
Reports indicate that this issue may affect applications such as CCH Engagement, Workpaper Manager, dental software (such as Dentrix and Softdent), and Zotero; other similar applications might also be impacted.
Third-party information disclaimer
The third-party products listed are manufactured by companies that are independent of Microsoft. We make no warranty, implied or otherwise, about the performance or reliability of these products.
Workaround
A resolution is in progress and will be included in a future Windows update. More information will be shared when it becomes available.
To work around this issue, open the application or document directly instead of launching it from the affected third-party application.
For organizations, a workaround is available for affected devices. To apply this workaround in your organization and mitigate the issue, please contact Microsoft Support for business.
Microsoft has received reports of an issue in which certain third-party applications might be unable to launch Microsoft Office applications or open documents after installing the Windows updates released on or after June 9, 2026. This issue affects certain third-party applications that use OLE automation to interact with Microsoft Office applications. In some cases, the Office application or document might fail to open without displaying an error message.
Affected Microsoft Office applications might include Word, Excel, PowerPoint, Access, and other Microsoft Office applications when launched from within the affected third-party application.
Reports indicate that this issue may affect applications such as CCH Engagement, Workpaper Manager, dental software (such as Dentrix and Softdent), and Zotero; other similar applications might also be impacted.
Third-party information disclaimer
The third-party products listed are manufactured by companies that are independent of Microsoft. We make no warranty, implied or otherwise, about the performance or reliability of these products.
Workaround
A resolution is in progress and will be included in a future Windows update. More information will be shared when it becomes available.
To work around this issue, open the application or document directly instead of launching it from the affected third-party application.
For organizations, a workaround is available for affected devices. To apply this workaround in your organization and mitigate the issue, please contact Microsoft Support for business.
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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