Microsoft has officially acknowledged a significant User Account Control (UAC) bug that is causing widespread installation issues across Windows 10 and Windows 11 systems.
The problem stems from a security update released in August 2025 and affects millions of users attempting to install or repair applications.
The Core Issue
The bug emerged following Microsoft’s August 2025 Windows security update (KB5063878), which introduced enhanced security measures to address vulnerability CVE-2025-50173.
While the update successfully patched a critical security flaw, it inadvertently created a new problem for standard users trying to perform routine software operations.
Users now encounter unexpected UAC prompts demanding administrator credentials when running Windows Installer (MSI) repair operations.
This affects popular applications including Autodesk AutoCAD, Civil 3D, Inventor CAM, and Microsoft Office Professional Plus 2010.
What Users Are Experiencing
The most common scenarios triggering these problematic UAC prompts include:
- 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
In severe cases, standard users attempting to install Office Professional Plus 2010 encounter Error 1730 during the configuration process, completely blocking installation.
Microsoft has classified this as a “mitigated” issue, meaning they have identified temporary workarounds while developing a permanent solution.
The company emphasizes that the security improvements were necessary to address a genuine vulnerability, making rollback inadvisable.
For immediate relief, Microsoft recommends users run affected applications as administrators by right-clicking the app from the Start menu and selecting “Run as administrator.” However, this solution isn’t viable when standard users lack administrative privileges.
For enterprise environments, IT administrators can implement a special Group Policy using Known Issue Rollback (KIR) by contacting Microsoft Support for business.
The company strongly advises against disabling security features as alternative workarounds.
Microsoft is actively developing a comprehensive fix that will allow IT administrators to permit specific applications to perform MSI repair operations without triggering UAC prompts.
This solution will be delivered through a future Windows update, though no specific timeline has been announced.
The bug affects multiple Windows versions, including Windows 11 versions 24H2, 23H2, and 22H2, plus Windows 10 versions 22H2, 21H2, and several Enterprise editions. Server versions including Windows Server 2025 and 2022 are also impacted.
This incident highlights the ongoing challenge of balancing security improvements with user experience, as Microsoft continues refining Windows 11’s rollout while maintaining system integrity.
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