n8n-MCP — Vulnerability (CVE-2026-45582)
Date: 2026-05
Affected: n8n-mcp/n8n-mcp
Attack vector: other
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-45582
CWE: CWE-201
CVSS: 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)

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.


Mitigations:

Architectural layers (MAESTRO):