What is CVE-2026-55608?

CVE-2026-55608 is a medium-severity vulnerability in Czlonkowski N8n-mcp, classified under Information Disclosure. CVSS score: 4.2/10. Published 2026-07-15.

How severe is CVE-2026-55608?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in Czlonkowski N8n-mcp

CVE-2026-55608

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-…

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

Affected products

Czlonkowski N8n-mcp — versions < 2.57.4

Weakness classification (CWE)

CWE-200 — Information Disclosure
CWE-863 — Incorrect Authorization

References

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

Frequently asked questions

What is CVE-2026-55608?: CVE-2026-55608 is a medium-severity vulnerability in Czlonkowski N8n-mcp, classified under Information Disclosure. CVSS score: 4.2/10. Published 2026-07-15.
How severe is CVE-2026-55608?: Medium severity. CVSS v3 base score is 4.2 out of 10.