medium6.5
CVE-2026-45582
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | n8n-mcp | < 2.51.3 | 2.51.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| N8n-Mcp | N8n-Mcp | before 2.51.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f3rg-xqjj-cj9w
- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
- https://github.com/czlonkowski/n8n-mcp/pull/782
- https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3
- https://nvd.nist.gov/vuln/detail/CVE-2026-45582