Critical severity9.8NVD Advisory· Published Sep 4, 2026
CVE-2026-85661
CVE-2026-85661
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.
Affected products
1- Range: <0.1.8
Patches
Vulnerability mechanics
References
4- github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/server.pynvd
- github.com/haris-musa/excel-mcp-server/blob/v0.1.8/src/excel_mcp/validation.pynvd
- github.com/haris-musa/excel-mcp-server/issues/149nvd
- www.vulncheck.com/advisories/excel-mcp-server-0.1.8-arbitrary-file-read-write-via-stdio-modenvd
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