What is CVE-2026-44694?

CVE-2026-44694 is a critical-severity vulnerability in Czlonkowski N8n-mcp, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 9.1/10. Published 2026-05-08.

How severe is CVE-2026-44694?

Critical severity. CVSS v3 base score is 9.1 out of 10.

SSRF in Czlonkowski N8n-mcp

CVE-2026-44694

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…

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

EPSS: 0.000 (3.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L.

Affected products

Czlonkowski N8n-mcp — versions >= 2.18.7, < 2.50.2
N8n-mcp

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Mitigation, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (Product, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-44694?: CVE-2026-44694 is a critical-severity vulnerability in Czlonkowski N8n-mcp, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 9.1/10. Published 2026-05-08.
How severe is CVE-2026-44694?: Critical severity. CVSS v3 base score is 9.1 out of 10.