MCP Observatory
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n8n-mcp

v2.57.4
npm

Integration between n8n workflow automation and Model Context Protocol (MCP)

maintainer
czlonkowski
license
MIT
first seen
2026-05-22
last seen
2026-06-14
releases · 30d
21
short id
risk51/100 · heuristic grade
C elevated

Source not yet analyzed — this grade rests on attested signals (CVEs, supply-chain) only. It is a floor: reading the code could raise it, not lower it.

  • vulnerabilitiesattested+50
  • inherited (deps)attested+15
  • trust mitigatorsmixed−14

attestedmixed

The A–E grade is our heuristic synthesis — a "review this" prompt, not a verdict. Each factor is tagged by what backs it: attested (a verifiable record), reported (a third party's claim), or inferred (our own heuristic, e.g. permissions). See methodology.

graded 6m ago · see ecosystem CVEs →

vulnerabilities9 CVEs · grade factor +50
HIGH
n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant headers ar… EPSS 0% CVE-2026-45707 CVSS 8.1 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.51.2"}]}]fixed in 2.51.2GHSANVDGHSAGHSA
HIGH
n8n-mcp affected by path traversal, redirect-following SSRF, and telemetry payload exposure CVSS 8.3 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.50.1"}]}]fixed in 2.50.1GHSAGHSAGHSAGHSA
HIGH
n8n-mcp webhook and API client paths has an authenticated SSRF EPSS 0% CVE-2026-44694 affects [{"type":"SEMVER","events":[{"introduced":"2.18.7"},{"fixed":"2.50.2"}]}]fixed in 2.50.2GHSANVDGHSAGHSA
HIGH
n8n-mcp's IPv4-mapped IPv6 addresses bypass SSRF protection in validateUrlSync(), enabling full SSRF… EPSS 0% CVE-2026-42449 CVSS 8.5 affects [{"type":"SEMVER","events":[{"introduced":"2.47.4"},{"fixed":"2.47.14"}]}]fixed in 2.47.14GHSANVDGHSAGHSA
HIGH
n8n-mcp has unauthenticated session termination and information disclosure in HTTP transport CVSS 8.2 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.47.6"}]}]fixed in 2.47.6GHSAGHSAGHSAGHSA
HIGH
n8n-mcp has authenticated SSRF via instance-URL header in multi-tenant HTTP mode EPSS 0% CVE-2026-39974 CVSS 8.5 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.47.4"}]}]fixed in 2.47.4GHSANVDGHSAGHSA
MEDIUM
n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters EPSS 0% CVE-2026-45582 CVSS 6.5 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.51.3"}]}]fixed in 2.51.3GHSANVDGHSAGHSA
MEDIUM
n8n-MCP: Sensitive MCP tool-call arguments logged on authenticated requests in HTTP mode EPSS 0% CVE-2026-42282 CVSS 4.3 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.47.13"}]}]fixed in 2.47.13GHSANVDGHSAGHSA
MEDIUM
n8n-MCP Logs Sensitive Request Data on Unauthorized /mcp Requests EPSS 0% CVE-2026-41495 CVSS 5.3 affects [{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.47.11"}]}]fixed in 2.47.11GHSANVDGHSAGHSA

inherited (deps) · grade factor +15

inherited via dependencies3
HIGH
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse via @modelcontextprotocol/sdk · 1 hop CVE-2026-25536 fixed in 1.26.0
HIGH
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability via @modelcontextprotocol/sdk · 1 hop CVE-2026-0621 fixed in 1.25.2
HIGH
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default via @modelcontextprotocol/sdk · 1 hop CVE-2025-66414 fixed in 1.24.0
tool safetyall quiet

No tool-safety findings — heuristic detectors run on the compute-risk cadence; a finding appears when a tool trips a rule.

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Heuristic, inferred signals — false positives (legitimately powerful tools, forks, language ports) are expected. Treat each as "review this", not a verdict. See the ecosystem-wide picture on the security hub, or the fleet security of czlonkowski.