Vulnerability in Czlonkowski N8n-Mcp
CVE-2026-45582
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Czlonkowski N8n-Mcp — versions < 2.51.3
- N8n-Mcp
Weakness classification (CWE)
References
- github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w (Mitigation, Vendor Advisory)
- github.com/czlonkowski/n8n-mcp/pull/782 (Patch, Issue Tracking)
- github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f (Patch)
- github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-45582?
- CVE-2026-45582 is a medium-severity vulnerability in Czlonkowski N8n-Mcp, classified under Insertion of Sensitive Information into Sent Data. CVSS score: 6.5/10. Published 2026-05-29.
- How severe is CVE-2026-45582?
- Medium severity. CVSS v3 base score is 6.5 out of 10.