PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-50357 Microsoft CVE debrief

A numeric truncation error in the Windows Resilient File System (ReFS) can allow an authorized attacker to execute code locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The vulnerability exists in the Windows Resilient File System (ReFS) and can be exploited by an authorized attacker to execute code locally. System administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and take necessary precautions.

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
2026-07-20
Advisory published
2026-07-14
Advisory updated
2026-07-20

Who should care

System administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and take necessary precautions to patch and mitigate this vulnerability.

Technical summary

The vulnerability exists in the Windows Resilient File System (ReFS) and can be exploited by an authorized attacker to execute code locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Defensive priority

High priority should be given to patching and mitigating this vulnerability, as it can allow for local code execution.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure that all Windows systems are up-to-date with the latest security patches
  • 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 2026-07-14T18:17:35.790Z and was last modified on 2026-07-20T17:21:44.333Z. The NVD entry is currently Analyzed. The vulnerability exists in the Windows Resilient File System (ReFS) and can be exploited by an authorized attacker to execute code locally. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The source details are limited, and defenders should verify the affected scope and severity with the official advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50357 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50357

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

  • CVE-2026-50357 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50357

    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.