Critical severity9.8NVD Advisory· Published Sep 4, 2026· Updated Sep 23, 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.
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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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