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TI-2026-33331 Aliases CVE-2026-45582GHSA-f3rg-xqjj-cj9w

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

Priority LOW 28CWE-201Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-201.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00262 18th percentileScored 2026-11-07
Fix Fixed n8n-mcp (czlonkowski): 2.51.3n8n-mcp (npm): 2.51.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
czlonkowskin8n-mcpbefore 2.51.32.51.3Patch availableCNA
—n8n-mcp (npm)before 2.51.32.51.3Patch availableGHSA-f3rg-xqjj-cj9w
  • n8n-mcp Vendorczlonkowski Affected before 2.51.3 Fixed in 2.51.3 Patch available CNA
  • n8n-mcp (npm) Vendor— Affected before 2.51.3 Fixed in 2.51.3 Patch available GHSA-f3rg-xqjj-cj9w

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:*before 2.51.3Vulnerableczlonkowski
  • cpe:2.3:a:n8n-mcp:n8n-mcp:*:*:*:*:*:*:*:* Versions before 2.51.3 Vulnerable ·czlonkowski

Remediation

  • Fix · CNA n8n-mcp (czlonkowski) Fixed in 2.51.3
  • Fix · GHSA-f3rg-xqjj-cj9w n8n-mcp (npm) Fixed in 2.51.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45582
  2. 2026-10-03 Alias added: GHSA-f3rg-xqjj-cj9w

References

Patch 2

Advisory 2

Other 2

  • TI-2026-38986 n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments CVSS 3.1CRITICAL 9.9
  • TI-2026-28830 n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode CVSS 3.1HIGH 8.5
  • TI-2026-30738 n8n-MCP: IPv4-mapped IPv6 addresses bypass SSRF protection in validateUrlSync(), enabling full SSRF for SDK embedders CVSS 3.1HIGH 8.5
  • TI-2026-33447 Improper access control in czlonkowski n8n-mcp CVSS 3.1HIGH 8.1
  • TI-2026-32585 n8n-MCP: Authenticated SSRF in n8n-mcp webhook and API client paths CVSS 4.0HIGH 7.2
  • TI-2026-30081 n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests CVSS 3.1MEDIUM 5.3
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences