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Vulnerability record · CVE-2026-85661 · published 4 September 2026

CVE-2026-85661: Path traversal vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.69% · top 49.3% CWE-22 · Path traversal Deferred
9.3CVSS 4.0 base score
0.69%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
23 Sep 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/haris-musa/excel-mcp-server
https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.py
https://github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.py
https://github.com/haris-musa/excel-mcp-server/issues/149
https://www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-mode

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Source: NIST National Vulnerability Database (record CVE-2026-85661), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.