June 9, 2026—KB5095051 (OS Build 28000.2269)

適用先

Windows 11 version 26H1, all editions

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 23, 2026	Known issue update: Added resolution for "Deleting from Recycle Bin displays an internal file name".
June 18, 2026	Known issue added: "Deleting from Recycle Bin displays an internal file name".
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:

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.
[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:

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 Office applications might fail to open from certain third-party apps

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

This issue is resolved in Windows updates released on and after July 14, 2026 such as KB5101649. We recommend you install the latest Windows update for your device as it contains important improvements and issue resolutions, including this one.

Deleting from Recycle Bin displays an internal file name

Symptoms

After you install Windows updates released on June 9, 2026, the confirmation dialog might display the internal Recycle Bin file name (for example, $Rxxxxx.ext) instead of the original file name when you permanently delete a single item. In Recycle Bin, the item still appears with its original name.

This issue affects only the confirmation dialog. In the Recycle Bin, the item still appears with its original file name. If you restore the item, Windows restores it using the original file name.

Workaround

This issue is addressed in KB5095091.

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.

Available	Next Step
	This update downloads and installs automatically from Windows Update and Microsoft Update.

Available	Next Step
	This update downloads and installs automatically from Windows Update for Business in accordance with configured policies.

Available Next Step

Available	Next Step
	To install this release from the Microsoft Update Catalog, follow these instructions: Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order. You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order). Method 1: Install all MSU files together Download all MSU files for KB5095051 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed. Updating Windows PC To apply this update to a running Windows PC, run the following command from an elevated Command Prompt: `DISM /Online /Add-Package /PackagePath:c:\packages\windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu` Or, run the following command from an elevated Windows PowerShell prompt: `Add-WindowsPackage -Online -PackagePath "c:\packages\windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu "` Or use Windows Update Standalone Installer to install the target update. Updating Windows Installation media To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update. Note: When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each. To add this update to a mounted image, run the following command from an elevated Command Prompt: `DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu` Or, run the following command from an elevated Windows PowerShell prompt: `Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu" -PreventPending` Method 2: Install each MSU file individually, in order Download and install each MSU file individually (if there are more than one .msu file) either using DISM or Windows Update Standalone Installer in the following order: windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu Note: This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.

To install this release from the Microsoft Update Catalog, follow these instructions:

Before you install this update, the standalone package(s) for this update is available from the Microsoft Update Catalog website. This KB contains one or more MSU files that require installation in a specific order.

You can install this update using Method 1 (install all MSU files together) or Method 2 (install each MSU file individually, in order).

Method 1: Install all MSU files together

Download all MSU files for KB5095051 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed.

Updating Windows PC

To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:

DISM /Online /Add-Package /PackagePath:c:\packages\windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu

Or, run the following command from an elevated Windows PowerShell prompt:

Add-WindowsPackage -Online -PackagePath "c:\packages\windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu "

Or use Windows Update Standalone Installer to install the target update.

Updating Windows Installation media

To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update.

Note: When downloading other Dynamic Update packages, ensure they match the same month as this KB. If the SafeOS Dynamic Update or Setup Dynamic Update is not available for the same month as this KB, use the most recently published version of each.

To add this update to a mounted image, run the following command from an elevated Command Prompt:

DISM /Image:mountdir /Add-Package /PackagePath:Windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu
Or, run the following command from an elevated Windows PowerShell prompt:

Add-WindowsPackage -Path "c:\offline" -PackagePath "Windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu" -PreventPending

Method 2: Install each MSU file individually, in order

Download and install each MSU file individually (if there are more than one .msu file) either using DISM or Windows Update Standalone Installer in the following order:

windows11.0-kb5095051-arm64_ef3e04f56b777265d964a4e3796a49d09bd567c6.msu

Note: This latest cumulative update includes updates for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.

Available	Next Step
	This update automatically syncs with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows: Product: Windows 11 Classification: Security Updates