PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-50402 Microsoft CVE debrief

CVE-2026-50402 is a HIGH-severity vulnerability in Windows NTFS that allows local privilege escalation. The vulnerability is caused by incorrect conversion between numeric types. An authorized attacker can exploit this vulnerability to elevate privileges locally. This vulnerability affects Windows 10, Windows 11, and Windows Server systems. System administrators should be aware of this vulnerability and apply patches as soon as possible.

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
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and users of Windows 10, Windows 11, and Windows Server should be aware of this vulnerability and apply patches as soon as possible. This vulnerability has a high CVSS score of 7.8, indicating a significant risk to affected systems.

Technical summary

The vulnerability is caused by incorrect conversion between numeric types in Windows NTFS. This allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. Affected systems include Windows 10, Windows 11, and Windows Server. Defenders should focus on patching and monitoring systems for suspicious activity.

Defensive priority

Highest priority should be given to patching affected systems, followed by monitoring for suspicious activity and implementing compensating controls to limit lateral movement. System administrators should review CVE and NVD details for further guidance.

Recommended defensive actions

  • Apply patches provided by Microsoft
  • Ensure Windows 10, Windows 11, and Windows Server systems are up-to-date
  • Monitor systems for suspicious activity
  • Implement compensating controls to limit lateral movement

Evidence notes

The CVE record was published on 2026-07-14T18:17:42.600Z and was last modified on 2026-07-20T17:41:52.043Z. The NVD entry is currently Analyzed. The vulnerability affects Windows 10, Windows 11, and Windows Server systems. Evidence is limited to CVE and NVD details. Defenders should verify system configurations and patch levels.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50402 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50402

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

  • CVE-2026-50402 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50402

    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.