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CVE-2026-50308 Microsoft CVE debrief

CVE-2026-50308 is an integer underflow (wrap or wraparound) vulnerability in Windows NTFS, allowing an unauthorized attacker to execute code locally. The vulnerability has a CVSS score of 7.8 and a severity of HIGH. This vulnerability affects Windows operating systems and has been publicly disclosed. System administrators and users should be aware of this vulnerability and take necessary precautions to protect their systems. The CVE record was published on 2026-07-14T17:16:58.927Z and has not been modified since then. The official CVE record and NVD detail provide further information on the vulnerability.

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 operating systems should be aware of this vulnerability and take necessary precautions to protect their systems. This includes reviewing system logs for suspicious activity, applying patches provided by Microsoft, and ensuring that all Windows operating systems are up-to-date.

Technical summary

The vulnerability is caused by an integer underflow (wrap or wraparound) in Windows NTFS. This can allow an unauthorized attacker to execute code locally. The vulnerability has a CVSS score of 7.8 and a severity of HIGH. The affected product context indicates that Windows operating systems are impacted. Defensive impact suggests that patching this vulnerability is of high priority. Source-grounded technical framing indicates that this is based on official CVE and NVD details.

Defensive priority

High priority should be given to patching this vulnerability as it allows for local code execution.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure that all Windows operating systems are up-to-date
  • 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 and NVD detail provide information on the vulnerability. Microsoft has provided a patch for this vulnerability. The vulnerability is an integer underflow (wrap or wraparound) in Windows NTFS, which can allow an unauthorized attacker to execute code locally. The source grounding indicates that this is based on official CVE and NVD details. Evidence limits suggest that further verification is needed to confirm affected scope and severity. Defenders should verify system logs for suspicious activity and review compensating controls.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50308 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50308

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

  • CVE-2026-50308 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50308

    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.