Windows 11 August 2025 security update is causing unintended UAC prompts to appear for non-admin users — some apps are crashing

Microsoft's August 2025 security update, designed to address a privilege escalation vulnerability, is causing unintended User Account Control (UAC) prompts for non-admin users on Windows 10 and 11, leading to app crashes and installation issues. The update, aiming to enhance security, has inadvertently made UAC prompts stricter, affecting various scenarios like MSI repair commands and app installations. This issue impacts a wide range of Windows versions, including Windows Server. Microsoft suggests workarounds like running problematic apps as Administrator or using Known Issue Rollback (KIR) for IT admins until a proper fix is implemented.