CVE-2026-0390

UEFI Secure Boot Security Feature Bypass Vulnerability

State: Published
Severity: 6.7 Medium
Published: Apr 14, 2026
Updated: Oct 15, 2026
Reserved: Nov 19, 2025

Description

Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.

Scores

CVSS	Score	Vector	Source
3.1	6.7 Medium	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-807 Reliance on Untrusted Inputs in a Security Decision

Affected Products

Product	Versions
Windows 10 Version 1607Microsoft	10.0.14393.0 to before 10.0.14393.9060Affected
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.8644Affected
Windows 10 Version 21H2Microsoft	10.0.19044.0 to before 10.0.19044.7184Affected
Windows 10 Version 22H2Microsoft	10.0.19045.0 to before 10.0.19045.7184Affected
Windows Server 2016Microsoft	10.0.14393.0 to before 10.0.14393.9060Affected
Windows Server 2016 (Server Core installation)Microsoft	10.0.14393.0 to before 10.0.14393.9060Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.8644Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.8644Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5020Affected

References

UEFI Secure Boot Security Feature Bypass Vulnerabilityvendor-advisorypatch

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