{"cve":"CVE-2026-41495","nvd":{"published":"2026-05-08T20:16:30.323","modified":"2026-10-26T18:10:00.173","status":"Analyzed","description":"n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to version 2.47.11, when n8n-mcp runs in HTTP transport mode, incoming requests to the POST /mcp endpoint had their request metadata written to server logs regardless of the authentication outcome. 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 from the Authorization header, per-tenant API keys from the, x-n8n-key header in multi-tenant setups, JSON-RPC request payloads sent to the MCP endpoint. Access control itself was not bypassed — unauthenticated requests were correctly rejected with 401 Unauthorized — but sensitive values from those rejected requests could still be persisted in logs. This issue has been patched in version 2.47.11.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","score":5.3},"cwes":["CWE-532"],"references":["https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.11","https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-pfm2-2mhg-8wpx"],"products":["n8n-mcp:n8n-mcp"],"source":"nvd","synced_at":"2026-10-26T18:27:13.530666824+00:00"},"epss":{"cve":"CVE-2026-41495","score":0.00255,"percentile":0.16929,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-pfm2-2mhg-8wpx","url":"https://osv.dev/vulnerability/GHSA-pfm2-2mhg-8wpx","summary":"n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests","modified":"2026-05-13T13:52:47.997231Z","packages":[{"ecosystem":"npm","name":"n8n-mcp","purl":"pkg:npm/n8n-mcp","ranges":["<2.47.11"],"fixed":["2.47.11"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}