n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
Summary
In affected versions of n8n-mcp, 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.
Impact
Operators with access to the project's telemetry backend could read partial fragments of workflow URL parameters that should not have been collected. The bug was scoped to URL-shaped fields in workflow definitions; credentials, OAuth tokens, and workflow execution data are not affected — credentials are removed by a separate code path, and long secrets and known-provider tokens are matched by dedicated patterns.
Patches
Fixed in n8n-mcp 2.51.3. Upgrading is the recommended remediation.
Workarounds
For users who cannot upgrade immediately, disable anonymous telemetry by setting any of these environment variables to true:
N8N_MCP_TELEMETRY_DISABLEDTELEMETRY_DISABLEDDISABLE_TELEMETRY
Credit
Reported by @u-ktdi.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | n8n-mcp | < 2.51.3 | 2.51.3 |
Referencias
- https://github.com/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
- https://nvd.nist.gov/vuln/detail/CVE-2026-45582
- https://github.com/czlonkowski/n8n-mcp/pull/782
- https://github.com/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
- https://github.com/czlonkowski/n8n-mcp
- https://github.com/czlonkowski/n8n-mcp/releases/tag/v2.51.3
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N- Debilidad (CWE)
CWE-201- Plataforma
- npm
- Paquete
n8n-mcp- Publicada
- 18.05.2026
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-f3rg-xqjj-cj9w - CC BY 4.0
Historial de vulnerabilidades: n8n-mcp
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 11
- Primera → última
- 04.2026 07.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 1
- Alta 6
- Media 4
Divulgaciones por año
- 2026: 11
-
n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters esta entrada
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