Windows UAC bug after the August 2025 update
Microsoft's August 2025 update caused a Windows UAC bug that triggers unplanned User Account Control (UAC) prompts throughout Windows environments. This problem originates from security improvements included in the August 12, 2025, cumulative patches for all supported Windows editions—specifically KB5063878 (Windows 11 24H2), KB5063875 (Windows 11 22H2/23H2), and KB5063709 (Windows 10 22H2 and Windows 10 Enterprise LTSC 2021)—which resolved CVE-2025-50173 but inadvertently created compatibility problems with Windows Installer maintenance functions.