CVE-2026-44694 PUBLISHED

n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API client paths

Assigner: GitHub_M
Reserved: 07.05.2026 Published: 08.05.2026 Updated: 08.05.2026

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. From version 2.18.7 to before version 2.50.2, there is an authenticated server-side request forgery vulnerability affecting the webhook trigger tools, the n8n API client (N8N_API_URL), and per-request URLs supplied via the x-n8n-url header in multi-tenant HTTP mode. This issue has been patched in version 2.50.2.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:L/VA:L/SC:H/SI:L/SA:L
CVSS Score: 7.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	High	Integrity	Low	Integrity	Low
Attack Requirements	Present	Availability	Low	Availability	Low
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	czlonkowski
Product	n8n-mcp
Versions	Version >= 2.18.7, < 2.50.2 is affected

References

Problem Types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition CWE
CWE-918: Server-Side Request Forgery (SSRF) CWE