CVE-2026-40576

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Source

https://cve.org/CVERecord?id=CVE-2026-40576

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40576.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-40576

Aliases

Published

2026-04-21T16:35:15.592Z

Modified

2026-07-15T01:49:20.979298455Z

Severity

9.4 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H CVSS Calculator

Summary

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in excel-mcp-server

Details

excel-mcp-server is a Model Context Protocol server for Excel file manipulation. A path traversal vulnerability exists in excel-mcp-server versions up to and including 0.1.7. When running in SSE or Streamable-HTTP transport mode (the documented way to use this server remotely), an unauthenticated attacker on the network can read, write, and overwrite arbitrary files on the host filesystem by supplying crafted filepath arguments to any of the 25 exposed MCP tool handlers. The server is intended to confine file operations to a directory set by the EXCELFILESPATH environment variable. The function responsible for enforcing this boundary — getexcelpath() — fails to do so due to two independent flaws: it passes absolute paths through without any check, and it joins relative paths without resolving or validating the result. Combined with zero authentication on the default network-facing transport and a default bind address of 0.0.0.0 (all interfaces), this allows trivial remote exploitation. This vulnerability is fixed in 0.1.8.

Database specific

{
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40576.json",
    "cwe_ids": [
        "CWE-22"
    ]
}

References

Affected packages

Git / github.com/haris-musa/excel-mcp-server

Affected ranges

Type

GIT

Repo

https://github.com/haris-musa/excel-mcp-server

Events

Introduced

Fixed

f51340ecd5778952405044b203d3a2d4c8a46833

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.1.8"
        }
    ]
}

Affected versions

v0.*

v0.1.1

v0.1.2

v0.1.3

v0.1.4

v0.1.5

v0.1.6

v0.1.7

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40576.json"