October 14, 2025—KB5066793 (OS Builds 22621.6060 and 22631.6060)
Applies To
Release Date:
10/14/2025
Version:
OS Builds 22621.6060 and 22631.6060
Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. This might affect the ability of certain personal and business devices to boot securely if not updated in time. To avoid disruption, we recommend reviewing the guidance and taking action to update certificates in advance. For details and preparation steps, see Windows Secure Boot certificate expiration and CA updates.
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​​​ ​​​​End of servicing Starting June 26, 2025, Windows 11 version 22H2 (Enterprise and Education editions) will no longer receive non-security preview updates. However, monthly security updates will continue through October 14, 2025. After that date, this version will reach the end of servicing and will no longer receive security updates. To stay protected and up to date, we recommend you upgrade to the latest version of Windows 11. |
To learn more about Windows update terminology, see types of Windows updates and monthly quality update types. For an overview, see the update history page for Windows 11, version 23H2.Â
Stay informed! Follow @WindowsUpdate for the latest updates from the Windows Release Health Dashboard.
Important: Windows updates do not install Microsoft Store application updates. If you are an enterprise user, see Microsoft Store apps - Configuration Manager. If you are a consumer user, see Get updates for apps and games in Microsoft Store.
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Tip: This month’s video is available in the Windows 11, version 24H2 article. |
Highlights
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This update addresses security issues for your Windows operating system. ​​​​​​​
​​​​​​​Improvements​​​​​​​
Important:Â Use EKBÂ KB5027397Â to update to Windows 11, version 23H2.
This security update includes quality improvements. Key changes include:
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This build includes all the improvements in Windows 11, version 22H2.
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There are no additional issues documented in this release.
This security update contains fixes and quality improvements from KB5065790Â (released September 23, 2025). The following summary outlines key issues addressed by this update. Also, included are available new features. The bold text within the brackets indicates the item or area of the change.
If you've already installed previous updates, your device will download and install only the new updates included in this package.
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[PowerShell] Fixed: This update addresses an issue that affects PowerShell Remoting and Windows Remote Management (WinRM), where commands might time out after 10 minutes.
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[Compatibility]Â This update removes the ltmdm64.sys driver. Fax modem hardware dependent on this specific driver will no longer work in Windows.
For more information about security vulnerabilities, see the Security Update Guide and the October 2025 Security Update.
Windows 11Â servicing stack update (KB5066792) - 22621.6051 and 22631.6051
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 and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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This update downloads and installs automatically from Windows Update and Microsoft Update. |
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This update downloads and installs automatically from Windows Update for Business in accordance with configured policies. |
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To get the standalone package for this update, go to Microsoft Update Catalog. |
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This update automatically syncs with Windows Server Update Services (WSUS) if you configure Products and Classifications as follows: Product: Windows 11 Classification: Security Updates |
If you want to remove the LCU
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File information
For a list of the files provided in this update, download the file information for cumulative update 5066793. Â
For a list of the files provided in the servicing stack update, download the file information for the SSU (KB5066792) - versions 22621.6051 and 22631.6051.Â
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