CVE-2026-45582

MEDIUM 6.5

n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-201
Vendor	czlonkowski
Product	n8n-mcp
Published	May 29, 2026
Last Updated	May 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

czlonkowski / n8n-mcp

< 2.51.3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w github.com: https://github.com/czlonkowski/n8n-mcp/pull/782 github.com: https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f github.com: https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3