Windows Update Is Causing Unexpected UAC Prompts and App Installation Issues

According to a notice published on the Windows Health Dashboard, Microsoft has confirmed that the routine security updates released in August are causing unexpected UAC prompts and application installation issues across all supported versions of Windows. The issue stems from a fix for CVE-2025-50173, a Windows Installer privilege escalation vulnerability, which could allow an authenticated attacker to elevate privileges to SYSTEM due to weak authentication.

To mitigate the flaw, Microsoft implemented a change requiring UAC prompts in certain scenarios, compelling users to enter administrator credentials before proceeding with actions such as using MSI repair commands, installing applications configured for a single user, and running Windows Installer during active installations.

The modification may block standard users from installing routine software or launching applications like AutoDesk, and Microsoft has acknowledged the problem and is preparing a fix expected to be released later this month. Affected systems include all versions of Windows 11 (including LTSC), Windows 10 versions 22H2, Windows 10 LTSB 2015/2016, Windows 10 LTSB 2019/2022, Windows Server 2016/2019/2022/2025, and Windows Server 2012/2012 R2.

For enterprise environments, Microsoft offers Known Issue Rollback to revert the changes, while home users can resolve it by running the affected application with administrator privileges.