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CVE-2026-85661

excel-mcp-server 0.1.8 Arbitrary File Read/Write via stdio mode

CVSS 4.0 9.3 CRITICALCVSS 3.1 9.8 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85661

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85661

Published

excel-mcp-server

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "haris-musa",
                    "product": "excel-mcp-server",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/excel-mcp-server",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.1.8"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON