CVE-2025-26644: Microsoft Windows 10 1809

Medium severity, CVSS 5.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Automated recognition mechanism with inadequate detection or handling of adversarial input perturbations in Windows Hello allows an unauthorized attacker to perform spoofing locally.

Affected products

• Microsoft Windows 10 1809: before 10.0.17763.7136 (fixed in 10.0.17763.7136)
• Microsoft Windows 10 21h2: before 10.0.19044.5737 (fixed in 10.0.19044.5737)
• Microsoft Windows 10 22h2: before 10.0.19045.5737 (fixed in 10.0.19045.5737)
• Microsoft Windows 11 22h2: before 10.0.22621.5189 (fixed in 10.0.22621.5189)
• Microsoft Windows 11 23h2: before 10.0.22631.5189 (fixed in 10.0.22631.5189)
• Microsoft Windows 11 24h2: before 10.0.26100.3775 (fixed in 10.0.26100.3775)
• Microsoft Windows Server 2019: before 10.0.17763.7136 (fixed in 10.0.17763.7136)
• Microsoft Windows Server 2025: before 10.0.26100.3775 (fixed in 10.0.26100.3775)

Published 2025-04-08. Last modified 2026-06-17.