CVE-2026-27906: Microsoft Windows 10 21h2

Medium severity, CVSS 4.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Improper input validation in Windows Hello allows an authorized attacker to bypass a security feature locally.

Affected products

• Microsoft Windows 10 21h2: before 10.0.19044.7184 (fixed in 10.0.19044.7184)
• Microsoft Windows 10 22h2: before 10.0.19045.7184 (fixed in 10.0.19045.7184)
• Microsoft Windows 11 23h2: before 10.0.22631.6936 (fixed in 10.0.22631.6936)
• Microsoft Windows 11 24h2: before 10.0.26100.8246 (fixed in 10.0.26100.8246)
• Microsoft Windows 11 25h2: before 10.0.26200.8246 (fixed in 10.0.26200.8246)
• Microsoft Windows 11 26h1: before 10.0.28000.1836 (fixed in 10.0.28000.1836)

Published 2026-04-14. Last modified 2026-06-17.