CVE-2026-50305 Microsoft CVE debrief

Who should care

Administrators and users of Microsoft Windows 11 and Windows Server 2025 systems should be aware of this vulnerability and take necessary precautions to mitigate its effects. This includes reviewing system configurations, applying patches or updates, and implementing compensating controls. Additionally, security teams and vulnerability management teams should prioritize this vulnerability due to its high severity and potential impact on system security.

Technical summary

The vulnerability is caused by a use-after-free issue in the Microsoft Brokering File System. This issue allows an authorized attacker to elevate privileges locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating a high level of severity. Affected products include Windows 11 24H2, 25H2, 26H1, and Windows Server 2025.

Defensive priority

High

Recommended defensive actions

• Apply patches or updates provided by Microsoft to vulnerable systems
• Implement compensating controls, such as monitoring and exception tracking
• Conduct inventory checks to identify vulnerable systems
• Consider implementing additional security measures, such as access controls and intrusion detection systems
• Review and verify system configurations to ensure they align with security best practices

Evidence notes

The CVE record was published on 2026-07-14T18:17:28.377Z and was last modified on 2026-07-16T19:41:59.217Z. The NVD entry is currently Analyzed. The vulnerability is caused by a use-after-free issue in the Microsoft Brokering File System. The source detail is limited, and defenders should verify the affected scope, severity, and vendor guidance. The CVE record and NVD entry provide evidence of the vulnerability's existence and its potential impact.

Official resources