Microsoft Confirms UAC Bug Disrupts App Installation on Windows 10 & 11

Cybersecurity

Microsoft has identified a significant issue with User Account Control (UAC) affecting software installation on Windows 10 and Windows 11 systems. This problem arose following a security update released in August 2025.

The Core Issue

The issue is linked to the August 2025 Windows security update (KB5063878), which addressed vulnerability CVE-2025-50173. While the update patched a critical security flaw, it has caused unexpected UAC prompts requiring administrator credentials during Windows Installer (MSI) repair operations.

This has impacted applications such as Autodesk AutoCAD, Civil 3D, Inventor CAM, and Microsoft Office Professional Plus 2010.

What Users Are Experiencing

The UAC prompts are triggered by the following actions:

• Running MSI repair commands
• Launching Autodesk applications for the first time after signing in
• Installing applications that configure themselves per user
• Running Windows Installer during Active Setup
• Deploying packages via Configuration Manager

Some users, particularly those installing Office Professional Plus 2010, encounter Error 1730, which blocks installation. Microsoft has classified this as a “mitigated” issue, with temporary workarounds available.

For immediate relief, the company suggests running affected applications as administrators. In enterprise environments, IT administrators can use a Group Policy with Known Issue Rollback (KIR) by contacting Microsoft Support. Disabling security features is not recommended.

Microsoft is developing a comprehensive fix to allow certain applications to perform MSI repair operations without UAC prompts. This fix will be part of a future Windows update.

The bug affects Windows 11 versions 24H2, 23H2, 22H2, Windows 10 versions 22H2, 21H2, several Enterprise editions, and server versions including Windows Server 2025 and 2022.