CVE-2026-44694

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

State: Published
Severity: 7.2 High
Published: May 8, 2026
Updated: May 12, 2026
Reserved: May 7, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.2 High	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	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
n8n-mcpczlonkowski	>= 2.18.7, < 2.50.2Affected

References

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