GHSA-4GGG-H7PH-26QR n8n-mcp has authenticated SSRF via instance-URL header in multi-tenant HTTP mode

Impact An authenticated Server-Side Request Forgery in n8n-mcp allows a caller holding a valid AUTHTOKEN to cause the server to issue HTTP requests to arbitrary URLs supplied through multi-tenant HTTP headers. Response bodies are reflected back through JSON-RPC, so an attacker can read the conten...