Protection Mechanism Failure in Windows and Windows Server - CVE-2026-45656
Published: June 12, 2026
Vulnerability identifier: #VU134480
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-45656
CWE-ID: CWE-693
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 implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in UEFI Secure Boot. A local user can bypass a security feature on the system.
How to mitigate CVE-2026-45656
Install updates from vendor's website.