What is CVE-2026-40576?

CVE-2026-40576 is a critical-severity vulnerability in Haris-musa Excel-mcp-server, classified under Path Traversal. CVSS score: 9.4/10. Published 2026-04-21.

How severe is CVE-2026-40576?

Critical severity. CVSS v3 base score is 9.4 out of 10.

Path Traversal in Haris-musa Excel-mcp-server

CVE-2026-40576

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 docum…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.001 (26.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H.

Affected products

Haris-musa Excel-mcp-server — versions < 0.1.8

Weakness classification (CWE)

CWE-22 — Path Traversal

References

https://github.com/haris-musa/excel-mcp-server/security/advisories/GHSA-j98m-w3xp-9f56 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-40576?: CVE-2026-40576 is a critical-severity vulnerability in Haris-musa Excel-mcp-server, classified under Path Traversal. CVSS score: 9.4/10. Published 2026-04-21.
How severe is CVE-2026-40576?: Critical severity. CVSS v3 base score is 9.4 out of 10.