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CVE-2026-50417 Microsoft CVE debrief

A high-severity vulnerability, CVE-2026-50417, exists in Windows NTFS, allowing an authorized attacker to execute code locally. This heap-based buffer overflow vulnerability has a CVSS score of 7.8 and is considered HIGH severity. The vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. System administrators and security teams should prioritize patching this vulnerability to prevent local code execution.

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
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

System administrators and security teams responsible for Windows systems, particularly those using Windows 10, Windows 11, and Windows Server, should prioritize patching this vulnerability to prevent local code execution. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

CVE-2026-50417 is a heap-based buffer overflow vulnerability in Windows NTFS. An authorized attacker can exploit this vulnerability to execute code locally. The vulnerability has a CVSS score of 7.8 and is considered HIGH severity. It affects various versions of Windows 10, Windows 11, and Windows Server. The vulnerability can be mitigated by applying the patch provided by Microsoft.

Defensive priority

High priority should be given to patching this vulnerability, as it allows for local code execution and has a high CVSS score. Additional security measures, such as restricting access to sensitive areas of the system, should be considered.

Recommended defensive actions

  • Apply the patch provided by Microsoft to vulnerable systems.
  • Ensure all Windows systems are up-to-date with the latest security patches.
  • Monitor systems for any suspicious activity that could indicate exploitation of this vulnerability.
  • Consider implementing additional security measures, such as restricting access to sensitive areas of the system.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE record was published on 2026-07-14T18:17:44.813Z and was last modified on 2026-07-21T15:19:33.400Z. The NVD entry is currently Analyzed. This information is based on the NVD entry and CVE record. Further verification is recommended to ensure accuracy.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50417 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50417

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

  • CVE-2026-50417 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50417

    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.