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CVE-2026-50448 Microsoft CVE debrief

A high-severity vulnerability, CVE-2026-50448, exists in Windows NTFS, allowing an unauthorized attacker to execute code locally through a heap-based buffer overflow. This vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. It affects various versions of Windows 10, Windows 11, and Windows Server. The vulnerability can be exploited locally, and defenders should be cautious of potential attacks. The source confidence is limited, and further verification is necessary to determine the full extent of 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, particularly those using Windows 10, Windows 11, and Windows Server, should be aware of this vulnerability and take necessary precautions. The vulnerability can be exploited locally, and defenders should be cautious of potential attacks. The source confidence is limited, and further verification is necessary to determine the full extent of the vulnerability.

Technical summary

CVE-2026-50448 is a heap-based buffer overflow vulnerability in Windows NTFS. An unauthorized attacker can exploit this vulnerability to execute code locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. It affects various versions of Windows 10, Windows 11, and Windows Server. The vulnerability can be exploited locally, and defenders should be cautious of potential attacks.

Defensive priority

High priority should be given to patching this vulnerability, as it allows for local code execution and has a high CVSS score.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure all Windows operating systems are up-to-date
  • Monitor system logs for suspicious activity
  • Implement additional security measures, such as access controls and intrusion detection systems
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record was published on 2026-07-14T18:17:49.290Z and last modified on 2026-07-21T16:44:11.440Z. The NVD entry is currently Analyzed. This vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. The evidence provided is limited, and defenders should verify the affected scope and severity with the vendor. The CVE record and NVD entry provide the most up-to-date information on this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50448 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50448

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

  • CVE-2026-50448 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50448

    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.