Improper Authentication in Microsoft Windows and Windows Server - CVE-2025-50173

Vulnerability identifier: #VU113982

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-50173

CWE-ID: CWE-287

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to bypass authentication process.

The vulnerability exists due to weak authentication in Windows Installer. A local user can bypass authentication process and gain elevated privileges on the system.

Microsoft Windows
Windows Server

Install updates from vendor's website.

Microsoft Windows - addressed in versions 10 21H2 10.0.19044.6216, 10 22H2 10.0.19045.6216, 10 1507 10.0.10240.21100, 10 1607 10.0.14393.8330, 10 1809 10.0.17763.7678, 11 22H2 10.0.22621.5768, 11 23H2 10.0.22631.5768, 11 24H2 10.0.26100.4851, 11 24H2 10.0.26100.4946
Windows Server - addressed in versions 2008 R2 6.1.7601.27872, 2008 6.0.6003.23471, 2012 R2 6.3.9600.22725, 2012 6.2.9200.25622, 2016 10.0.14393.8330, 2019 10.0.17763.7678, 2022 23H2 10.0.25398.1791, 2022 10.0.20348.3989, 2022 10.0.20348.4052, 2025 10.0.26100.4851, 2025 10.0.26100.4946

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-50173

• Improper Authentication in Microsoft Windows Installer