Executive brief
A security vulnerability has been identified in the Microsoft Brokering File System, a component of the Windows operating system. An attacker who already has basic access to a system could exploit this flaw to gain full administrative control. This could allow them to view sensitive data, install malicious software, or disrupt business operations.
Technical details
A use-after-free vulnerability (CWE-416) exists in the Microsoft Brokering File System. The flaw is triggered when the system attempts to access memory that has already been freed, leading to memory corruption. An attacker with low-privileged local access can exploit this condition to execute code with elevated system privileges. The attack requires high complexity, likely involving specific timing or race conditions, but does not require user interaction. Microsoft has released security updates to address this issue across affected Windows 11 and Windows Server 2025 versions.
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: advisory: Initial publication by Microsoft and NVD
- 2026-07-14: patched: Security updates made available by Microsoft