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CVE-2026-50318 Microsoft CVE debrief

CVE-2026-50318 is a stack-based buffer overflow vulnerability in the Windows Resilient File System (ReFS). An authorized attacker can exploit this vulnerability locally to elevate privileges. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. This vulnerability affects Windows systems using ReFS, and system administrators should review system configurations to limit local access to sensitive systems. The CVE record and NVD entry provide additional context for understanding the vulnerability and its potential impact.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

System administrators and security teams responsible for Windows systems, particularly those using ReFS, should be aware of this vulnerability and take steps to mitigate it. This includes reviewing system configurations to limit local access to sensitive systems and monitoring system logs for suspicious activity. Additionally, security teams should implement additional security controls to prevent local privilege escalation and conduct regular vulnerability assessments and penetration testing.

Technical summary

The vulnerability exists in the Windows Resilient File System (ReFS) and allows an authorized attacker to elevate privileges locally through a stack-based buffer overflow. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating a high severity vulnerability. This vulnerability is particularly concerning for environments where local privilege escalation is a concern. Defenders should review system configurations and patch levels to ensure systems are not exposed.

Defensive priority

High priority should be given to patching and mitigating this vulnerability, especially in environments where local privilege escalation is a concern. Defenders should focus on applying patches provided by Microsoft and reviewing system configurations to limit local access to sensitive systems.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Review and update system configurations to limit local access to sensitive systems
  • Monitor system logs for suspicious activity
  • Implement additional security controls to prevent local privilege escalation
  • Conduct regular vulnerability assessments and penetration testing

Evidence notes

The CVE record was published on 2026-07-14T17:16:59.410Z and last modified on 2026-07-16T14:38:26.033Z. The NVD entry is currently Analyzed. This vulnerability affects Windows systems using ReFS, and defenders should verify system configurations and patch levels. Evidence from the CVE record and NVD entry indicates a high severity vulnerability with a CVSS score of 7.8. Additional verification is recommended to ensure systems are not exposed.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:59.410Z and has not been modified since then. The NVD entry is currently Analyzed.