CVE-2026-45707

The record

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-request from x-n8n-url / x-n8n-key headers. Requests that omitted those headers — or supplied only one of them — silently fell back to the process-level N8N_API_URL / N8N_API_KEY credentials configured for the operator's own n8n instance. As a result, an authenticated MCP tenant could cause n8n management calls to execute against the operator's instance instead of its own. This affects HTTP-mode deployments of n8n-mcp that are run as a shared multi-tenant service. Single-tenant deployments (ENABLE_MULTI_TENANT unset or false) are not affected. This vulnerability is fixed in 2.51.2.

Affected packages

Related vulnerabilities

• GHSA-jxx9-px88-pj69 n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant… Same vulnerability
• CVE-2026-45582 n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation… Also affects n8n-mcp
• GHSA-f3rg-xqjj-cj9w n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node… Also affects n8n-mcp
• CVE-2026-42282 n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation… Also affects n8n-mcp
• CVE-2026-44694 n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation… Also affects n8n-mcp
• CVE-2026-41495 n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation… Also affects n8n-mcp
• GHSA-8g7g-hmwm-6rv2 n8n-mcp affected by path traversal, redirect-following SSRF, and telemetry payload… Also affects n8n-mcp
• GHSA-cmrh-wvq6-wm9r n8n-mcp webhook and API client paths has an authenticated SSRF Also affects n8n-mcp