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CVE-2026-27203

eBay API MCP Server is an open source local MCP server providing AI assistants with comprehensive access to eBay's Sell APIs. All versions are vulnerable to Environment Variable Injection through the updateEnvFile function. The ebay_set_user_tokens tool allows updating the .env file with new tokens. The updateEnvFile function in src/auth/oauth.ts blindly appends or replaces values without validating them for newlines or quotes. This allows an attacker to inject arbitrary environment variables in
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0c3567ee31bb24433ae97a09f69345377d48e5052aee38c02af785449b1a0dad
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-15","description":"CWE-15: External Control of System or Configuration Setting","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"ebay-mcp","vendor":"YosefHayim","versions":[{"status":"affected","version":"<= 1.7.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.3,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/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:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-15","description":"CWE-15: External Control of System or Configuration Setting","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-74","description":"CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b3c4a9a","tags":["x_refsource_MISC"],"url":"https://github.com/YosefHayim/ebay-mcp/commit/aab0bda75ea9dd27aa37d0d8524d7cf41b3c4a9a"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/references/1
{"name":"https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh","tags":["x_refsource_CONFIRM"],"url":"https://github.com/YosefHayim/ebay-mcp/security/advisories/GHSA-97rm-xj73-33jh"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4c08876507cad0ffa67c8d68ef54fe6f961bca4dd47a63ee44e51a81d73b3285 · sha256:6ed8ed31134c83bd… · /containers/cna/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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