CVE-2025-26649: Windows Secure Channel Elevation of Privilege Vulnerability

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% 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-362

Description

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Secure Channel allows an authorized attacker to elevate privileges locally.

Affected products

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 11: before 10.0.26100.3775 — fixed in 10.0.26100.3775
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 Server 2025: before 10.0.26100.3775 — fixed in 10.0.26100.3775
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 11: from 10.0.26100.0 before 10.0.26100.3775 — fixed in 10.0.26100.3775
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
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.3775 — fixed in 10.0.26100.3775

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.22621.5189; Microsoft Windows 11 10.0.22631.5189; Microsoft Windows 11 10.0.26100.3775; Microsoft Windows Server 2022 10.0.20348.3453; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1551; Microsoft Windows Server 2025 10.0.26100.3775; Microsoft Windows 11 10.0.22621.5189; Microsoft Windows 11 version 22H3 10.0.22631.5189; Microsoft Windows 11 10.0.22631.5189; Microsoft Windows 11 10.0.26100.3775; Microsoft Windows Server 2022 10.0.20348.3453; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1551. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26649

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