[English]On October 14, 2025 (the second Tuesday of the month, Microsoft's patch day), Microsoft released cumulative updates for the still-supported client operating system versions of Windows 10 and Windows 11. Here are some details about these updates, which are designed to fix vulnerabilities and issues.
Details about the security vulnerabilities addressed by the updates are described in the article Microsoft Security Update Summary (October 14, 2025).
Updates for Windows 11
A list of Windows 11 updates can be found on this Microsoft website. I have extracted the details below. Microsoft now provides the following updates for the above-mentioned Windows 11 version.
Update KB5066835 for Windows 11 24H2-25H2
Cumulative Update KB5066835 includes quality improvements and security patches. This update makes various security improvements to internal operating system functions. Microsoft lists some details about fixes in its support article, including the following.
- [Browser] Fixed: This update addresses an issue that caused the print preview screen to stop responding in Chromium-based browsers.
- [Gaming] Fixed: An issue occurred when users signed in to a Windows device using only a Gamepad at the lock screen. If no other input methods—such as touch or fingerprint—were used during sign-in, apps and games did not respond to input afterward.
- [PowerShell]
- Fixed: This update addresses an issue that affects PowerShell Remoting and Windows Remote Management (WinRM), where commands might time out after 10 minutes.
- Fixed: This update addresses an issue that prevented an audit event from being logged.
- [Windows Hello] Fixed: This update addresses an issue that affects the setup process for Windows Hello face recognition when using USB infrared camera modules. Users were unable to complete setup due to a persistent error message, such as "Make sure your face is centered in the frame."
- [Compatibility] This update removes the ltmdm64.sys driver. Fax modem hardware dependent on this specific driver will no longer work in Windows.
This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The Windows 11 Servicing Stack Update is integrated into the patch. Any problems caused by the update are listed in the support article.
Important: A prerequisite for installation is that the CheckPoint update KB5043080 from September 10, 2024, is installed (see also my post Windows 11 24H2: Update KB5051987 fails with installation error 0x800F0838 from February 2025).
Update KB5066793 for Windows 11 22H2-23H2
Cumulative Update KB5066793 includes quality improvements and security patches. Details about the fixes can be found in the support article. This update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog and via WSUS and WUfB. The Windows 11 Servicing Stack Update is integrated into the patch. Known issues that may be caused by the update are listed in the support article.
Windows 11 Version 22H2 Home and Pro are no longer supported. The Enterprise and Education versions will continue to receive security updates.
Updates for Windows 10
A list of updates can be found on this Microsoft website. I've extracted the details below.
Update KB5066791 for Windows 10 Version 21H2 – 22H2
Cumulative Update KB5066791 contains various security fixes. Version 21H2 only supports the Enterprise, Education, and IoT versions. The support article lists several fixes. This is the last security update for Windows 10 22H2; future patches will only be available with an ESU license.
Microsoft advises that this update implements quality improvements to the servicing stack (responsible for Microsoft updates). This update will be downloaded and installed automatically from Windows Update, but is also available from the Microsoft Update Catalog and via WSUS and WUfB. Please note the installation instructions (required SSU) and any known issues described in the support article.
Update KB5066586 for Windows 10 Enterprise 2019 LTS
Cumulative Update KB5066586 (sorted under Windows 10 v1809, but refers to Windows 10 2019 Enterprise LTSC and IoT Enterprise LTSC) and includes security fixes. Various improvements and bug fixes have also been mentioned.
The update is automatically downloaded and installed by Windows Update, but is also available in the Microsoft Update Catalog, via WSUS, and WUfB. Microsoft has also updated the Service Stack Update (SSU). Please note the installation requirements and information about potential issues described in the support article.
Updates for Windows 10 Versionen 1507 and 1607
Updates for the Enterprise LTSC versions are available for Windows 10 RTM and version 1607. These updates are automatically downloaded and installed by Windows Update, but are also available for download from the Microsoft Update Catalog (search for the KB number). Before manual installation, the latest Servicing Stack Update (SSU) must be installed. Details can be found in the respective KB article.
- Windows 10 Version 1607: Update KB5066836 is now only available for Enterprise LTSC and Windows Server 2016. The update addresses security issues and contains fixes.
- Windows 10 Version 1507: Update KB5066837 is available for the RTM version (LTSC). The update addresses security issues and contains a fix.
For these two updates, please also note the installation requirements listed in the support articles and any known issues that may be mentioned.
There was no update for the other Windows 10 versions, as these versions are no longer supported. If in doubt, details on the above updates can be found in the relevant Microsoft KB articles.
Similar articles:
Microsoft Security Update Summary (October 14, 2025)
Patchday: Windows 10/11 Updates (October 14, 2025)
Patchday: Windows Server-Updates (October 14, 2025)
Patchday: Microsoft Office Updates (October 14, 2025)
