CVE-2026-0390

UEFI Secure Boot Security Feature Bypass Vulnerability

CVE-2026-0390 is fixed in 16 products on 1 platform, first by KB5082198, released April 14, 2026. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

6.7

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0032

24th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows 10 Version 1607 for 32-bit Systems	14393.9060	KB5082198	Apr 14, 2026
Windows 10 Version 1607 for x64-based Systems	14393.9060	KB5082198	Apr 14, 2026
Windows 10 Version 1809 for 32-bit Systems	17763.8644	KB5082123	Apr 14, 2026
Windows 10 Version 1809 for x64-based Systems	17763.8644	KB5082123	Apr 14, 2026
Windows 10 Version 21H2 for 32-bit Systems		KB5082200	Apr 14, 2026
Windows 10 Version 21H2 for ARM64-based Systems		KB5082200	Apr 14, 2026
Windows 10 Version 21H2 for x64-based Systems		KB5082200	Apr 14, 2026
Windows 10 Version 22H2 for 32-bit Systems		KB5082200	Apr 14, 2026
Windows 10 Version 22H2 for ARM64-based Systems		KB5082200	Apr 14, 2026
Windows 10 Version 22H2 for x64-based Systems		KB5082200	Apr 14, 2026
Windows Server 2016	14393.9060	KB5082198	Apr 14, 2026
Windows Server 2016 (Server Core installation)	14393.9060	KB5082198	Apr 14, 2026
Windows Server 2019	17763.8644	KB5082123	Apr 14, 2026
Windows Server 2019 (Server Core installation)	17763.8644	KB5082123	Apr 14, 2026
Windows Server 2022	20348.5020	KB5082142	Apr 14, 2026
Windows Server 2022 (Server Core installation)	20348.5020	KB5082142	Apr 14, 2026

Details

Published
April 14, 2026
Weakness
Reliance on Untrusted Inputs in a Security Decision
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-0390

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