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PatchSiren cyber security CVE debrief

CVE-2026-62771 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-11T17:18:29.750Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability, CVE-2026-62771, is caused by a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver, allowing an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7.8, indicating a high severity level. Multiple versions of Windows 10, Windows 11, and Windows Server are affected by this vulnerability. System administrators and security teams responsible for Windows systems, especially those using Windows 10, Windows 11, and Windows Server, should be aware of this vulnerability and take necessary actions to mitigate it. The CVE-2026-62771 record indicates a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver. According to the NVD, this vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-08-16
Advisory published
2026-08-11
Advisory updated
2026-08-16

Who should care

System administrators and security teams responsible for Windows systems, especially those using Windows 10, Windows 11, and Windows Server, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The CVE-2026-62771 vulnerability is caused by a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver. This vulnerability allows an authorized attacker to elevate privileges locally. The CVSS score for this vulnerability is 7.8, indicating a high severity level. Multiple versions of Windows 10, Windows 11, and Windows Server are affected by this vulnerability.

Defensive priority

This vulnerability allows an authorized attacker to elevate privileges locally, which could lead to a significant impact on the system's security. Therefore, it is essential to apply the necessary patches or mitigations to prevent exploitation.

Recommended defensive actions

  • Apply the official patch from Microsoft
  • Review and update affected Windows systems
  • Monitor system logs for suspicious activity
  • Implement compensating controls to limit local privilege escalation
  • Verify system configurations and inventory

Evidence notes

The CVE-2026-62771 record indicates a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver. According to the NVD, this vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62771 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62771

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

  • CVE-2026-62771 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62771

    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.