{"id":"EUVD-2026-28824","revision":null,"records":[{"revision":"52e8aeeb6ffd4590ab3115f7df0afdd2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42282","aliases":[],"title":"n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode","description":"n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. In deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of: bearer tokens and OAuth credentials sent through n8n_manage_credentials, per-tenant API keys and webhook auth headers embedded in tool arguments, arbitrary secret-bearing payloads passed to any MCP tool. The issue requires authentication (AUTH_TOKEN accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. This issue has been patched in version 2.47.13.","state":0,"publishedAt":"2026-05-08T19:07:13.823+00:00","modifiedAt":"2026-05-12T18:32:11.186+00:00","affected":[{"ecosystem":"Vendor product","name":"n8n-mcp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"czlonkowski\",\n                    \"product\": \"n8n-mcp\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 2.47.13\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-wg4g-395p-mqv3","https://github.com/czlonkowski/n8n-mcp/commit/59b665bda36797823df238aeaf20adb862c9f451","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.13"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42282","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42282","identifiers":["CVE-2026-42282"]},"retained":false,"historicalAffected":[]},{"revision":"6ba408e8e34244b281e4f5ced3845e59","observedAt":"2026-11-07T09:33:29.857+00:00","statement":{"source":"euvd","id":"EUVD-2026-28824","aliases":["CVE-2026-42282","GHSA-wg4g-395p-mqv3"],"title":"n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full argu…","description":"n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. 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Prior to version 2.47.13, when n8n-mcp runs in HTTP transport mode, authenticated MCP tools/call requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably n8n_manage_credentials.data — the raw values can be persisted in logs. In deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of: bearer tokens and OAuth credentials sent through n8n_manage_credentials, per-tenant API keys and webhook auth headers embedded in tool arguments, arbitrary secret-bearing payloads passed to any MCP tool. The issue requires authentication (AUTH_TOKEN accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. This issue has been patched in version 2.47.13.","state":0,"publishedAt":"2026-05-08T20:16:31.717+00:00","modifiedAt":"2026-10-26T18:10:00.173+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/czlonkowski/n8n-mcp/commit/59b665bda36797823df238aeaf20adb862c9f451","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.13","https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-wg4g-395p-mqv3"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42282","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-532"],"productCriteria":["cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-05-08T20:16:31.717","lastModified":"2026-10-26T18:10:00.173"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-42282","identifiers":["CVE-2026-42282"]},"retained":false,"historicalAffected":[]},{"revision":"6df28ee4edf14c799b6480d4731c98e7","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-wg4g-395p-mqv3","aliases":["CVE-2026-42282"],"title":"n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode","description":"### Impact\n\nWhen `n8n-mcp` runs in HTTP transport mode, authenticated MCP `tools/call` requests had their full arguments and JSON-RPC params written to server logs by the request dispatcher and several sibling code paths before any redaction. When a tool call carries credential material — most notably `n8n_manage_credentials.data` — the raw values can be persisted in logs.\n\nIn deployments where logs are collected, forwarded to external systems, or viewable outside the request trust boundary (shared log storage, SIEM pipelines, support/ops access), this can result in disclosure of:\n\n- bearer tokens and OAuth credentials sent through `n8n_manage_credentials`\n- per-tenant API keys and webhook auth headers embedded in tool arguments\n- arbitrary secret-bearing payloads passed to any MCP tool\n\nThe issue requires authentication (`AUTH_TOKEN` accepted by the server), so unauthenticated callers cannot trigger it; the runtime exposure is also reduced by an existing console-silencing layer in HTTP mode, but that layer is fragile and the values are still constructed and passed into the logger. The fix removes the leak at the source.\n\nImpact category: **CWE-532** (Insertion of Sensitive Information into Log File). CVSS 3.1 score: **4.3 Medium** (`AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`).\n\n### Affected\n\nDeployments running n8n-mcp **v2.47.12 or earlier** in HTTP transport mode (`MCP_MODE=http`). The stdio transport short-circuits the relevant log calls and is not affected in practice.\n\n### Patched\n\n**v2.47.13** and later.\n\n- npm: `npx n8n-mcp@latest` (or pin to `>= 2.47.13`)\n- Docker: `docker pull ghcr.io/czlonkowski/n8n-mcp:latest`\n\nThe patch routes tool-call arguments through a metadata-only summarizer (`summarizeToolCallArgs`) that records type, top-level key names, and approximate size — never values. The same pattern was adopted earlier for HTTP request bodies in GHSA-pfm2-2mhg-8wpx.\n\n### Workarounds\n\nIf developers cannot upgrade immediately:\n\n- Restrict access to the HTTP port (firewall, reverse proxy, or VPN) so only trusted clients can authenticate.\n- Restrict access to server logs (no shared SIEM ingestion, no support read-only access) until the upgrade lands.\n- Switch to stdio transport (`MCP_MODE=stdio`, the default for CLI invocation), which has no HTTP surface and short-circuits the affected log calls.\n\n### Credit\n\nn8n-MCP thanks [@Mirr2](https://github.com/Mirr2) (Organization / Jormungandr) for reporting this issue.","state":0,"publishedAt":"2026-04-25T23:35:28+00:00","modifiedAt":"2026-05-13T13:54:48.095286+00:00","affected":[{"ecosystem":"npm","name":"n8n-mcp","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.47.13"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-wg4g-395p-mqv3","https://nvd.nist.gov/vuln/detail/CVE-2026-42282","https://github.com/czlonkowski/n8n-mcp/commit/59b665bda36797823df238aeaf20adb862c9f451","https://github.com/czlonkowski/n8n-mcp","https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.13"],"sourceUrl":"https://github.com/advisories/GHSA-wg4g-395p-mqv3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-wg4g-395p-mqv3","identifiers":["GHSA-wg4g-395p-mqv3","CVE-2026-42282"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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