Description
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.
Problem types
CWE-201: Insertion of Sensitive Information Into Sent Data
Product status
References
github.com/...8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
github.com/czlonkowski/n8n-mcp/pull/782
github.com/...ommit/6cf6fef653fcd6d598f2f356aac4754931c7329f
github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3