CVE-2026-27906 Windows Hello Security Feature Bypass Vulnerability
An authorized local attacker can bypass Windows Hello security features due to improper input validation, requiring a patch from Microsoft.
- 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-2026-27906?
CVE-2026-27906 is a medium-severity vulnerability in Microsoft Windows 10 21h2, 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
Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.
Weakness: CWE-20
Which versions are affected by CVE-2026-27906?
It affects 6 products.
Products include Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1.
How do I fix CVE-2026-27906?
No fix has been published for CVE-2026-27906 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-27906 being exploited?
There is no known exploitation of CVE-2026-27906 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 21h2
- CVE-2025-21333 Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow
- CVE-2025-21334 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2025-21335 Microsoft Windows Hyper-V NT Kernel Integration VSP Use-After-Free
- CVE-2026-42904 Windows TCP/IP Elevation of Privilege Vulnerability
- CVE-2026-105733 Windows Hyper-V Remote Code Execution Vulnerability
Sources
Also known as GHSA-qqjc-23pp-wrrm.