CVE-2026-0390 UEFI Secure Boot Security Feature Bypass Vulnerability
An authorized local attacker can bypass UEFI Secure Boot protections in the Windows Boot Loader due to reliance on untrusted inputs.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0390?
CVE-2026-0390 is a medium-severity vulnerability in Microsoft Windows 10 1607, published on 14 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Reliance on untrusted inputs in a security decision in Windows Boot Loader allows an authorized attacker to bypass a security feature locally.
Weakness: CWE-807
Which versions are affected by CVE-2026-0390?
It affects 7 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows Server 2016, Microsoft Windows Server 2019 and 1 more.
How do I fix CVE-2026-0390?
No fix has been published for CVE-2026-0390 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-0390 being exploited?
There is no known exploitation of CVE-2026-0390 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-crrm-44jr-89j8.