CVE-2026-45582

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

Published May 29, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-f3rg-xqjj-cj9w n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
History
Type Values Removed Values Added
First Time appeared N8n-mcp
N8n-mcp n8n-mcp
CPEs cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*
Vendors & Products N8n-mcp
N8n-mcp n8n-mcp
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Czlonkowski
Czlonkowski n8n-mcp
Vendors & Products Czlonkowski
Czlonkowski n8n-mcp
Type Values Removed Values Added
Description 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.
Title n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
Weaknesses CWE-201
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
May 29, 2026, 6:44 PM
Reserved
May 12, 2026, 7:00 PM
Status
Analyzed
Published
May 29, 2026, 2:16 PM
Modified
Jul 21, 2026, 12:10 PM