What is CVE-2026-54052?

CVE-2026-54052 is a critical-severity vulnerability in Czlonkowski N8n-mcp, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.9/10. Published 2026-07-15.

How severe is CVE-2026-54052?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Auth bypass in Czlonkowski N8n-mcp

CVE-2026-54052

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version…

Vulnerability class: IDOR (Insecure Direct Object Reference)

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

Affected products

Czlonkowski N8n-mcp — versions < 2.56.1

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key
CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-54052?: CVE-2026-54052 is a critical-severity vulnerability in Czlonkowski N8n-mcp, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.9/10. Published 2026-07-15.
How severe is CVE-2026-54052?: Critical severity. CVSS v3 base score is 9.9 out of 10.