What is CVE-2026-39974?

CVE-2026-39974 is a high-severity vulnerability in Czlonkowski N8n-mcp, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-04-09.

How severe is CVE-2026-39974?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in Czlonkowski N8n-mcp

CVE-2026-39974

n8n-MCP is a Model Context Protocol (MCP) server that provides AI assistants with comprehensive access to n8n node documentation, properties, and operations. Prior to 2.47.4, an authenticated Server-Side Request Forgery in n8n-mcp allows a…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (2.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Czlonkowski N8n-mcp — versions < 2.47.4

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-4ggg-h7ph-26qr (x_refsource_CONFIRM)
https://github.com/czlonkowski/n8n-mcp/commit/d9d847f230923d96e0857ccecf3a4dedcc9b0096 (x_refsource_MISC)
https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.47.4 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-39974?: CVE-2026-39974 is a high-severity vulnerability in Czlonkowski N8n-mcp, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-04-09.
How severe is CVE-2026-39974?: High severity. CVSS v3 base score is 8.5 out of 10.