Improper access control in Microsoft Windows and Windows Server - CVE-2026-50418
Published: July 17, 2026
Vulnerability identifier: #VU138023
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-50418
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to bypass an authentication feature and disclose sensitive information.
The vulnerability exists due to improper access control in Windows System when handling local access to the system. A local attacker can exploit the access control weakness to bypass an authentication feature and disclose sensitive information.
The vulnerability allows impersonation and could also enable modification of disclosed information.
Affected software
Microsoft Windows
Windows Server
Windows Server
How to mitigate CVE-2026-50418
Install security update from vendor's website.
Microsoft Windows - addressed in versions 11 24H2 10.0.26100.8875, 11 25H2 10.0.26200.8875, 11 26H1 10.0.28000.2269, 11 26H1 10.0.28000.2525
Windows Server - addressed in versions 2012 R2 6.3.9600.23291, 2022 10.0.20348.5386, 2025 10.0.26100.33158
Windows Server - addressed in versions 2012 R2 6.3.9600.23291, 2022 10.0.20348.5386, 2025 10.0.26100.33158