Executive brief
A security vulnerability exists in the Microsoft Brokering File System, a component of the Windows operating system. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.
Technical details
A double free vulnerability (CWE-415) exists in the Microsoft Brokering File System, often triggered by a race condition (CWE-362) during concurrent execution using shared resources. The flaw allows a locally authenticated attacker with low privileges to execute code in a higher-privileged context, potentially gaining SYSTEM-level access. The attack vector is local, requiring no user interaction. Microsoft has released security updates for affected versions of Windows 11 and Windows Server 2025 to address this issue.
Affected products
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26200.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2269
- Microsoft Windows Server 2025 10.0.26100.0 to 10.0.26100.33158
Timeline
- 2026-07-14: disclosed
- 2026-07-14: advisory