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PatchSiren cyber security CVE debrief

CVE-2026-50401 Microsoft CVE debrief

CVE-2026-50401 is an out-of-bounds read vulnerability in Windows Cloud Files Mini Filter Driver. An authorized attacker can exploit this vulnerability to disclose information locally. The vulnerability has a CVSS score of 5.5 and a severity of MEDIUM. This type of vulnerability can allow attackers with local access to gain sensitive information, potentially leading to further exploitation. System administrators should prioritize patching this vulnerability to prevent local information disclosure.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 5.5
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 systems should be aware of this vulnerability and take necessary precautions to protect their systems. Prioritization should be given to systems with high-risk exposure or sensitive data. Vulnerability management and security teams should ensure patches are applied and monitor for potential exploitation.

Technical summary

The vulnerability is caused by an out-of-bounds read in the Windows Cloud Files Mini Filter Driver. This allows an authorized attacker to disclose information locally. The vulnerability has been assigned a CVSS score of 5.5 and a severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. Technical details are limited, but it is known to affect Windows 10, Windows 11, and Windows Server systems.

Defensive priority

Medium priority should be given to patching this vulnerability, as it allows an authorized attacker to disclose information locally. However, the risk may be higher for systems with sensitive data or high exposure.

Recommended defensive actions

  • Apply the patch provided by Microsoft to fix the vulnerability.
  • Ensure that all Windows systems are up-to-date with the latest security patches.
  • Monitor system logs for any 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 vulnerability is described in the CVE record and the NVD detail page. Microsoft has provided a patch for the vulnerability. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems and apply patches or mitigations as needed. Additional information may be available from Microsoft support resources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50401 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50401

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

  • CVE-2026-50401 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50401

    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.