cve-2025-50173

The August 2025 Windows security update introduced a hardening to Windows Installer that closed a real privilege‑escalation hole (CVE‑2025‑50173) — but the fix also changed MSI repair semantics in ways that caused unexpected User Account Control (UAC) prompts and silent repair failures for many...

Microsoft’s August 26, 2025 preview entry for KB5064080 (OS Build 22631.5840) documents a deliberate security hardening in Windows Installer that now enforces a User Account Control (UAC) elevation prompt for certain MSI repair and related operations—a change that fixed an elevation‑of‑privilege...

Microsoft’s September Patch Tuesday delivers a surgical corrective: the cumulative updates released on September 9, 2025 refine the User Account Control (UAC) behavior introduced in August and restore expected installer and streaming behavior while preserving the security hardening that closed...

Microsoft’s September Patch Tuesday has quietly closed two disruptive Windows regressions introduced in August — one that interfered with MSI-based app installs by unexpectedly surfacing User Account Control (UAC) prompts for standard users, and another that crippled NDI-based streaming...

Microsoft’s August 2025 security rollup hardened Windows Installer to close a privilege‑escalation hole, but the change has also begun prompting unexpected User Account Control (UAC) credential requests and breaking app installations for standard (non‑administrator) users across many Windows...

Microsoft has confirmed a new compatibility problem that emerged after the August 12, 2025 cumulative security updates: a Windows Installer hardening intended to close a privilege‑escalation hole (tracked as CVE‑2025‑50173) is now triggering unexpected User Account Control (UAC) prompts for...

Microsoft’s August security rollup intended to close a Windows Installer privilege‑escalation hole but instead changed repair semantics in a way that makes many standard (non‑admin) users see unexpected User Account Control (UAC) prompts or fail with MSI Error 1730 when launching applications...

Microsoft’s August cumulative for Windows 11 — shipped as KB5063878 (OS Build 26100.4946) on August 12, 2025 — has become the subject of two very different but intersecting headaches: an enterprise deployment regression that broke WSUS/SCCM installs (error 0x80240069) and a cluster of...

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...

Microsoft has confirmed that its August 12, 2025 cumulative security update introduced a security hardening to Windows Installer that is triggering unexpected User Account Control (UAC) prompts and breaking silent MSI repair/configuration flows for standard (non‑administrator) users across a...

Microsoft’s August 12, 2025 cumulative update for Windows 11 — delivered as KB5063878 (OS Build 26100.4946) — introduced a security hardening to Windows Installer that closed a real privilege-escalation risk but also changed how MSI “self‑repair” and per‑user configuration flows behave, leading...

Microsoft’s August security hardening that patched a Windows Installer flaw has closed a real attack vector — but it also introduced a compatibility headache that is prompting UAC credential prompts and outright failures in environments that rely on per‑user MSI repair and advertising flows. The...

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)...

Microsoft has confirmed and mitigated a compatibility regression introduced by the August 12, 2025 security update KB5063878 that caused unexpected User Account Control (UAC) prompts and failed repairs for applications using Windows Installer (MSI), with the Windows Server 2025 release-health...

Microsoft’s August cumulative update chain, notably KB5063878, introduced a hardening to Windows Installer that has forced a rethink of how User Account Control (UAC) and MSI "self‑repair" flows behave — and that hardening, while closing a real security gap (tracked as CVE‑2025‑50173), has also...

Microsoft's August 2025 cumulative updates have produced a high‑profile compatibility regression that prevents many non‑administrator users from completing per‑user MSI installations and self‑repairs, prompting emergency mitigations from Microsoft and a wave of operational guidance for IT teams...

Microsoft has confirmed that its August 12, 2025 cumulative updates — most notably KB5063878 for Windows 11 (OS Build 26100.4946) and companion packages for Windows 10 and Windows Server — introduced a UAC-related regression that prevents many non‑administrator users from performing routine...

Title: CVE‑2025‑50173 — Windows Installer “Weak Authentication” Elevation‑of‑Privilege: What admins need to know and do now Summary Microsoft lists CVE‑2025‑50173 as an elevation‑of‑privilege vulnerability in Windows Installer. The vendor description summarizes the issue as “weak authentication...