KB5079466: improves the reliability of choosing trusted catalog files

March 10, 2026—KB5079466 (OS Build 28000.1719)

Improvements
This security update contains fixes and quality improvements from KB5077239 (released February 10, 2026). 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.

• [Windows Defender Application Control] Improved: This update improves how Windows Defender Application Control (WDAC) handles COM objects allowlisting policies. COM objects were blocked when the endpoint security policy was set higher than the allowlisting policy. With this update, COM objects are allowed as expected.
• [Windows System Image Manager​​​​​​​] Improved: This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source. ​​​​​​​