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 view sensitive data, install malicious software, or disrupt business operations.
Technical details
This vulnerability is classified as a use-after-free (CWE-416) and may involve a race condition (CWE-362) within the Microsoft Brokering File System. An attacker with low-privileged local access can trigger the flaw to execute code in a higher-privileged context, such as SYSTEM. The attack vector is local, requiring the attacker to already have an account or a foothold on the target machine. Microsoft has released security updates to address this issue across affected versions of Windows 11 and Windows Server 2025.
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