Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| N8N-Mcp | N8N-Mcp | < 2.51.2 |
Related Weaknesses (CWE)
References
- https://github.com/czlonkowski/n8n-mcp/commit/853015d0897be7cf2d9d4726de195c938ePatch
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.2ProductRelease Notes
- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-jxx9-px88-pj69MitigationVendor Advisory
FAQ
What is CVE-2026-45707?
CVE-2026-45707 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-45707?
CVE-2026-45707 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45707?
Check the references section above for vendor advisories and patch information. Affected products include: N8N-Mcp N8N-Mcp.