What is CVE-2026-45707?

CVE-2026-45707 is a high-severity vulnerability in Czlonkowski N8n-mcp, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-05-29.

How severe is CVE-2026-45707?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Czlonkowski N8n-mcp

CVE-2026-45707

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.2, when ENABLE_MULTI_TENANT=true, the HTTP transport documents that the target n8n instance is selected per-re…

EPSS: 0.000 (10.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Czlonkowski N8n-mcp — versions < 2.51.2
N8n-mcp

Weakness classification (CWE)

CWE-284 — Improper Access Control

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-2026-45707?: CVE-2026-45707 is a high-severity vulnerability in Czlonkowski N8n-mcp, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-05-29.
How severe is CVE-2026-45707?: High severity. CVSS v3 base score is 8.1 out of 10.