Microsoft’s August cumulative update intended to close a Windows Installer privilege‑escalation hole instead tightened the User Account Control (UAC) rules so aggressively that standard (non‑administrator) users now see unexpected UAC prompts and, in many cases, cannot complete everyday app...
cve-2025-50173
first run
kb5063878
kir
known issue rollback
msi
patch
per-userrepair
privilege escalation
uac
windows
windows 10
windows 11
windows installation
windows server
Microsoft has acknowledged a compatibility regression introduced by the August 12, 2025 cumulative Windows updates that can cause unexpected User Account Control (UAC) elevation prompts and MSI Error 1730 failures for non‑administrator users when applications trigger Windows Installer (MSI)...