Use of a broken or risky cryptographic algorithm in Windows and Windows Server - CVE-2026-50303
Published: July 17, 2026
Vulnerability identifier: #VU137993
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50303
CWE-ID: CWE-327
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 user to bypass the authentication feature.
The vulnerability exists due to use of a cryptographic primitive with a risky implementation in Windows Key Guard when processing authentication operations. A local user can exploit the flawed cryptographic implementation to bypass the authentication feature.
This vulnerability can enable impersonation.
How to mitigate CVE-2026-50303
Install security update from vendor's website.