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CVE-2025-49694: 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: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-08 · updated 2026-06-17
• Weakness: CWE-476

Description

Null pointer dereference in Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.

Affected products

• Microsoft Windows 11: before 10.0.26100.4652 — fixed in 10.0.26100.4652
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): before 10.0.25398.1732 — fixed in 10.0.25398.1732
• Microsoft Windows Server 2025: before 10.0.26100.4652 — fixed in 10.0.26100.4652
• Microsoft Windows 11: from 10.0.26100.0 before 10.0.26100.4652 — fixed in 10.0.26100.4652
• Microsoft Windows Server 2022, 23H2 Edition (Server Core installation): from 10.0.25398.0 before 10.0.25398.1732 — fixed in 10.0.25398.1732
• Microsoft Windows Server 2025: from 10.0.26100.0 before 10.0.26100.4652 — fixed in 10.0.26100.4652

How to fix

Upgrade to a fixed version: Microsoft Windows 11 10.0.26100.4652; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732; Microsoft Windows Server 2025 10.0.26100.4652; Microsoft Windows 11 10.0.26100.4652; Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.1732; Microsoft Windows Server 2025 10.0.26100.4652. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49694

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