SB2026011401 - Security Feature Bypass in Microsoft Secure Boot Certificate Expiration
Published: January 14, 2026
Security Bulletin ID
SB2026011401
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Reliance on Component That is Not Updateable (CVE-ID: CVE-2026-21265)
CWE-ID: CWE-1329 - Reliance on Component That is Not Updateable
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to compromise the target system.
The vulnerability exists due reliance on component that is not updateable within Secure Boot Certificate Expiration. A local administrator can bypass Secure Boot on the system.
Remediation
Install update from vendor's website.