CVE-2026-50312 Microsoft CVE debrief

Who should care

System administrators and users of Windows operating systems should be aware of this vulnerability and apply patches as available. This vulnerability has a CVSS score of 4.7 and a severity rating of MEDIUM, indicating a moderate level of risk. Affected operators and security teams should review official advisories and take necessary precautions to mitigate this vulnerability.

Technical summary

The vulnerability is a Use after free issue in the Windows Ancillary Function Driver for WinSock. This could allow an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 4.7, with a severity rating of MEDIUM. The vulnerability affects Windows operating systems and requires local access for exploitation.

Defensive priority

Apply patches as available; monitor system logs for suspicious activity; conduct regular vulnerability assessments

Recommended defensive actions

• Apply patches as available
• Monitor system logs for suspicious activity
• Conduct regular vulnerability assessments
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets

Evidence notes

The CVE record was published on 2026-07-14T18:17:29.503Z and was last modified on 2026-07-16T19:48:07.280Z. The NVD entry is currently Analyzed. This vulnerability affects Windows Ancillary Function Driver for WinSock, and its exploitation requires local access. The CVSS score for this vulnerability is 4.7, indicating a MEDIUM severity level. To verify and mitigate this vulnerability, defenders should review official advisories and apply patches as available.

Official resources