CVE-2025-26635: Microsoft Windows 10 1809

Medium severity, CVSS 6.5. EPSS: 1.5% chance of exploitation in the next 30 days.

Weak authentication in Windows Hello allows an authorized attacker to bypass a security feature over a network.

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 Server 2019: before 10.0.17763.7136 (fixed in 10.0.17763.7136)
• Microsoft Windows Server 2022: before 10.0.20348.3453 (fixed in 10.0.20348.3453)
• Microsoft Windows Server 2022 23h2: before 10.0.25398.1551 (fixed in 10.0.25398.1551)

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