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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 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 t
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e0b9785d523363ae569b4339481ea0bec6892a56c395ee843c2f729fd90e4ca2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"excel-mcp-server","vendor":"haris-musa","versions":[{"status":"affected","version":"< 0.1.8"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.4,"baseSeverity":"CRITICAL","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/cna/metrics/0/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.4,"baseSeverity":"CRITICAL","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/haris-musa/excel-mcp-server/security/advisories/GHSA-j98m-w3xp-9f56","tags":["x_refsource_CONFIRM"],"url":"https://github.com/haris-musa/excel-mcp-server/security/advisories/GHSA-j98m-w3xp-9f56"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/haris-musa/excel-mcp-server/security/advisories/GHSA-j98m-w3xp-9f56"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:b1835d06d7c8eb4b6803198ea7c0b4b7141b5835f6e81c511334192e623a990f · sha256:a26ec246e55de1cf… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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