KB5065431:[App compatibility (known issue)] Fixed

September 9, 2025—KB5065431 (OS Builds 22621.5909 and 22631.5909)

Highlights
This update addresses security issues for your Windows operating system. ​​​​​​​

​​​​​​​Improvements​​​​​​​
Windows 11, version 22H2: Enterprise and Education editions
This security update contains fixes and quality improvements from KB5064080 (released August 26, 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.

• [App compatibility (known issue)] Fixed: Addresses an issue that caused non-admin users to receive unexpected User Account Control (UAC) prompts when MSI installers perform certain custom actions. These actions might include configuration or repair operations in the foreground or background, during the initial installation of an application.
• This issue could prevent non-admin users from running apps that perform MSI repairs, including Office Professional Plus 2010 and multiple applications from Autodesk (including AutoCAD). This fix reduces the scope for requiring UAC prompts for MSI repairs and enables IT admins to disable UAC prompts for specific apps by adding them to an allowlist.

For more information, see Unexpected UAC prompts when running MSI repair operations after installing the August 2025 Windows security update.

• [File server] This update enabled auditing SMB client compatibility for SMB Server signing as well as SMB Server EPA. This allows customers to assess their environment and identify any potential device or software incompatibility issues before deploying the hardening measures that are already supported by SMB Server. For detailed guidance, see CVE-2025-55234.

If you've already installed previous updates, your device will download and install only the new updates included in this package.