Improper access control in Windows and Windows Server - CVE-2026-50418
Published: July 17, 2026
Vulnerability identifier: #VU138023
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-50418
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
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.
How to mitigate CVE-2026-50418
Install security update from vendor's website.