Feb 2026: Windows Hyper-V Security Feature Bypass Vulnerability
CVE-2026-21255 Published on February 10, 2026
Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.
Weakness Type
What is an Authorization Vulnerability?
The software does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVE-2026-21255 has been classified to as an Authorization vulnerability or weakness.
Products Associated with CVE-2026-21255
You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-21255 are published in these products:
Affected Versions
Microsoft Windows 11 version 26H1:- Version 10.0.28000.0 and below 10.0.28000.1575 is affected.
- Version 10.0.28000.0 and below 10.0.28000.1575 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8389 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8389 is affected.
- Version 10.0.17763.0 and below 10.0.17763.8389 is affected.
- Version 10.0.20348.0 and below 10.0.20348.4773 is affected.
- Version 10.0.19044.0 and below 10.0.19044.6937 is affected.
- Version 10.0.19045.0 and below 10.0.19045.6937 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32370 is affected.
- Version 10.0.26200.0 and below 10.0.26200.7840 is affected.
- Version 10.0.22631.0 and below 10.0.22631.6649 is affected.
- Version 10.0.22631.0 and below 10.0.22631.6649 is affected.
- Version 10.0.25398.0 and below 10.0.25398.2149 is affected.
- Version 10.0.26100.0 and below 10.0.26100.7840 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32370 is affected.
- Version 10.0.14393.0 and below 10.0.14393.8868 is affected.
- Version 10.0.14393.0 and below 10.0.14393.8868 is affected.
- Version 10.0.14393.0 and below 10.0.14393.8868 is affected.