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CVE-2026-50311 Microsoft CVE debrief

CVE-2026-50311 is a HIGH severity vulnerability in Windows Server with a CVSS score of 7.8. It allows an authorized attacker to elevate privileges locally due to improper access control. The CVE record was published on 2026-07-14T17:16:59.090Z and was last modified on 2026-07-16T14:41:17.747Z. The NVD entry is currently Analyzed. This vulnerability is caused by improper access control in Windows Server, allowing an authorized attacker to elevate privileges locally. 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 Local attack vector with Low complexity and privileges required. The weakness is classified under CWE-284. System administrators and security teams responsible for Windows Server installations should be aware of this vulnerability. Given its HIGH severity and local privilege escalation potential, priority should be given to patching affected systems. Affected products include various versions of Windows 10, Windows 11, and Windows Server. The CVE record and NVD details were used to generate this debrief. Additional information was derived from the vendor's advisory.

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 Server installations should be aware of this vulnerability. Given its HIGH severity and local privilege escalation potential, priority should be given to patching affected systems.

Technical summary

The vulnerability, CVE-2026-50311, is caused by improper access control in Windows Server, allowing an authorized attacker to elevate privileges locally. 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 Local attack vector with Low complexity and privileges required. The weakness is classified under CWE-284.

Defensive priority

High priority should be given to patching affected Windows Server installations. System administrators should review and apply the vendor's patch as soon as possible.

Recommended defensive actions

  • Apply the vendor's patch for CVE-2026-50311
  • Review and update affected Windows Server installations
  • Monitor system logs for potential exploitation attempts
  • Implement compensating controls such as additional authentication or access restrictions
  • Conduct regular vulnerability assessments and inventory checks

Evidence notes

The CVE record and NVD details were used to generate this debrief. Additional information was derived from the vendor's advisory. Affected products include various versions of Windows 10, Windows 11, and Windows Server.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-14T17:16:59.090Z and has not been modified since then. The NVD entry is currently Analyzed.