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PatchSiren cyber security CVE debrief

CVE-2026-50390 Microsoft CVE debrief

CVE-2026-50390 is a HIGH severity vulnerability in Windows Kernel caused by access of resource using incompatible type ('type confusion'). An authorized attacker can exploit this vulnerability to elevate privileges locally. This vulnerability affects Windows 10, Windows 11, and Windows Server products. Users should apply patches immediately to prevent local privilege escalation attacks. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. The CVE record was published on 2026-07-14T18:17:40.913Z and was last modified on 2026-07-21T12:27:25.457Z.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Users of Windows 10, Windows 11, and Windows Server products should apply patches immediately to prevent local privilege escalation attacks. System administrators and security teams should review the official CVE record and NVD entry for further details and verify their systems.

Technical summary

The vulnerability is caused by a type confusion in the Windows Kernel. This allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7 and a CVSS severity of HIGH. Affected products include Windows 10, Windows 11, and Windows Server. Users should review and update Windows Kernel configurations to prevent exploitation.

Defensive priority

Apply patches immediately to prevent local privilege escalation attacks. Review and update Windows Kernel configurations. Monitor system logs for suspicious activity.

Recommended defensive actions

  • Apply patches provided by Microsoft
  • Review and update Windows Kernel configurations
  • Monitor system logs for suspicious activity
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:17:40.913Z and was last modified on 2026-07-21T12:27:25.457Z. The NVD entry is currently Analyzed. This vulnerability affects Windows 10, Windows 11, and Windows Server products. Users should verify their systems and apply patches as needed. The evidence provided is limited, and defenders should review the official CVE record and NVD entry for further details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50390 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50390

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-50390 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50390

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.