CVE-2025-29970: Microsoft Brokering File System Elevation of Privilege Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-05-13 · updated 2026-06-17
Weakness: CWE-416

Description

Use after free in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

Affected products

Microsoft Windows 11: before 10.0.26100.4061 — fixed in 10.0.26100.4061
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1611 — fixed in 10.0.25398.1611
Microsoft Windows Server 2025: before 10.0.26100.4061 — fixed in 10.0.26100.4061
Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4061 — fixed in 10.0.26100.4061
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1611 — fixed in 10.0.25398.1611
Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4061 — fixed in 10.0.26100.4061

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.4061; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1611; Microsoft Windows Server 2025 10.0.26100.4061; Microsoft Windows 11 10.0.26100.4061; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1611; Microsoft Windows Server 2025 10.0.26100.4061. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29970

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