| Component | n8n |
| Severity | medium (CVSS 6.5) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| Published (NVD) | 2026-05-29 |
| Last modified | 2026-07-21 |
| Affected versions | n8n-mcp < 2.51.3 |
| Fixed in | 2.51.3 |
| Weakness | CWE-201 |
| CISA KEV | not listed |
NVD 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.
What to do
- Upgrade n8n to
2.51.3or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-45582
- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
- https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
- https://github.com/czlonkowski/n8n-mcp/pull/782
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3
Read more
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