CVE Catalog

CVE-2026-85661

CriticalCVSS 9.8
Published: Translated: NVD NIST

Summary

excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked file paths to access any file accessible to the process.

Risk Assessment

The risk includes unauthorized access to sensitive system files and potential modification, leading to confidentiality and integrity breaches.

Recommendation

Set the EXCEL_FILES_PATH variable and implement path validation to restrict access to allowed directories only.

Related vulnerabilities

Original NVD description (English source)

excel-mcp-server 0.1.8 fails to enforce path confinement in stdio mode when EXCEL_FILES_PATH is unset, allowing attackers to read and write arbitrary files. Attackers can supply unchecked file paths to read and write tools to access any file accessible to the process.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS