CVE-2025-26635: Windows Hello Security Feature Bypass Vulnerability

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-08 · updated 2026-08-10
Weakness: CWE-1390

Description

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

Affected products

Microsoft Windows 10: before 10.0.17763.7136 — fixed in 10.0.17763.7136
Microsoft Windows 10: before 10.0.19044.5737 — fixed in 10.0.19044.5737
Microsoft Windows 10: before 10.0.19045.5737 — fixed in 10.0.19045.5737
Microsoft Windows 11: before 10.0.22621.5189 — fixed in 10.0.22621.5189
Microsoft Windows 11: 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 Edition (Server Core installation): before 10.0.25398.1551 — fixed in 10.0.25398.1551
Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.7136 — fixed in 10.0.17763.7136
Microsoft Windows 10: from 10.0.19044.0 before 10.0.19044.5737 — fixed in 10.0.19044.5737
Microsoft Windows 10: from 10.0.19045.0 before 10.0.19045.5737 — fixed in 10.0.19045.5737
Microsoft Windows 11: from 10.0.22621.0 before 10.0.22621.5189 — fixed in 10.0.22621.5189
Microsoft Windows 11 version 22H3: from 10.0.22631.0 before 10.0.22631.5189 — fixed in 10.0.22631.5189
Microsoft Windows 11: from 10.0.22631.0 before 10.0.22631.5189 — fixed in 10.0.22631.5189
Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.7136 — fixed in 10.0.17763.7136
Microsoft Windows Server 2022: from 10.0.20348.0 before 10.0.20348.3453 — fixed in 10.0.20348.3453
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1551 — fixed in 10.0.25398.1551

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.7136; Microsoft Windows 10 10.0.19044.5737; Microsoft Windows 10 10.0.19045.5737; Microsoft Windows 11 10.0.22621.5189; Microsoft Windows 11 10.0.22631.5189; Microsoft Windows Server 2019 10.0.17763.7136; Microsoft Windows Server 2022 10.0.20348.3453; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1551; Microsoft Windows 10 10.0.17763.7136; Microsoft Windows 10 10.0.19044.5737; Microsoft Windows 10 10.0.19045.5737; Microsoft Windows 11 10.0.22621.5189. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26635

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