#VU122545 Improper Authentication in Windows and Windows Server - CVE-2026-21508

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Main Vulnerability Database Vulnerabilities #VU122545

#VU122545 Improper Authentication in Windows and Windows Server - CVE-2026-21508

Published: February 10, 2026


Vulnerability identifier: #VU122545
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-21508
CWE-ID: CWE-287
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Windows
Windows Server
Software vendor:
Microsoft

Description

The vulnerability allows a local user to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in Windows Storage. A local user can bypass authentication process and gain elevated privileges on the target system.


Remediation

Install updates from vendor's website.

External links