Flowengine N8n Workflow Builder — the complete, unedited output of the deterministic mcptrustchecker engine v1.13.0, scanned . Every finding, capability tag and score component below is exactly what the engine produced — no AI, no post-processing.
{
"tool": {
"name": "mcptrustchecker",
"version": "1.13.0",
"methodologyVersion": "mcptrustchecker-1.13"
},
"target": {
"id": "flowengine-n8n-workflow-builder",
"source": {
"kind": "package",
"origin": "flowengine-n8n-workflow-builder"
},
"server": {
"name": "flowengine-n8n-workflow-builder"
}
},
"grade": "A",
"score": {
"score": 93,
"threatScore": 100,
"grade": "A",
"band": "A",
"categorySubtotals": {
"injection": 0,
"exfiltration": 0,
"permissions": 0,
"supply-chain": 0,
"network": 0,
"hygiene": 0
},
"vector": [
{
"kind": "client",
"term": "capability-exposure",
"level": "high",
"label": "capability blast radius (high) — client exposure if the model is manipulated",
"appliedPenalty": 6
},
{
"kind": "client",
"term": "verification-discount",
"level": "repo",
"label": "publisher verification (public source) — no provenance, but the source is public and inspectable",
"appliedPenalty": 1
},
{
"kind": "client",
"term": "coverage-honesty",
"level": "source",
"label": "inspection depth (source) — how much of the target the scan could see",
"appliedPenalty": 0
}
],
"gatesFired": [],
"methodologyVersion": "mcptrustchecker-1.13"
},
"capability": {
"level": "high",
"reasons": [
"ingests untrusted external content (a prompt-injection entry point)",
"can execute shell commands or code"
],
"tags": [
"untrusted-input",
"code-exec"
]
},
"coverage": {
"level": "source",
"inputs": {
"toolSurface": true,
"implementationSource": true,
"packageMetadata": true,
"liveTransport": false
},
"caveats": [
"Tools were statically extracted from the published source (28 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command \"npx -y <package>\"."
]
},
"findings": [
{
"ruleId": "MTC-SRC-001",
"title": "Dynamic code execution in server code (dist/lib/security.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/lib/security.js:49`): Evaluating strings as code is the most direct RCE primitive; if any tool input reaches it, the server executes attacker-chosen code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/lib/security.js"
},
"evidence": "message: 'Use of eval() detected - potential code injection', node: node.name,",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-001",
"file": "dist/lib/security.js",
"line": 49,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-001",
"title": "Dynamic code execution in server code (src/lib/security.ts)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/lib/security.ts:66`): Evaluating strings as code is the most direct RCE primitive; if any tool input reaches it, the server executes attacker-chosen code. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "src/lib/security.ts"
},
"evidence": "message: 'Use of eval() detected - potential code injection', node: node.name, recommendation",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-001",
"file": "src/lib/security.ts",
"line": 66,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (dist/lib/security.js)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`dist/lib/security.js:63`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/lib/security.js"
},
"evidence": "ing' && (code.includes('child_process') || code.includes('exec'))) { issues.push({ s",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "dist/lib/security.js",
"line": 63,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-002",
"title": "Shell/command execution in server code (src/lib/security.ts)",
"category": "permissions",
"severity": "high",
"confidence": "strong",
"description": "In the server's implementation (`src/lib/security.ts:82`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "src/lib/security.ts"
},
"evidence": "ing' && (code.includes('child_process') || code.includes('exec'))) { issues.push({ severity: 'critical",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-002",
"file": "src/lib/security.ts",
"line": 82,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-005",
"title": "Dynamic module load from a non-literal (dist/lib/node-descriptions.js)",
"category": "permissions",
"severity": "medium",
"confidence": "heuristic",
"description": "In the server's implementation (`dist/lib/node-descriptions.js:50`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/lib/node-descriptions.js"
},
"evidence": "onst nodeModule = await import(nodeModulePath); // Get the node class - find the class constructor export",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-005",
"file": "dist/lib/node-descriptions.js",
"line": 50,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-005",
"title": "Dynamic module load from a non-literal (dist/lib/node-loader.js)",
"category": "permissions",
"severity": "medium",
"confidence": "heuristic",
"description": "In the server's implementation (`dist/lib/node-loader.js:51`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "dist/lib/node-loader.js"
},
"evidence": "onst nodeModule = await import(nodeModulePath); // Get the default export (the node class) const NodeCla",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-005",
"file": "dist/lib/node-loader.js",
"line": 51,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-005",
"title": "Dynamic module load from a non-literal (src/lib/node-descriptions.ts)",
"category": "permissions",
"severity": "medium",
"confidence": "heuristic",
"description": "In the server's implementation (`src/lib/node-descriptions.ts:63`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "src/lib/node-descriptions.ts"
},
"evidence": "onst nodeModule = await import(nodeModulePath); // Get the node class - find the class constructor export let N",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-005",
"file": "src/lib/node-descriptions.ts",
"line": 63,
"nonRuntime": false
}
},
{
"ruleId": "MTC-SRC-005",
"title": "Dynamic module load from a non-literal (src/lib/node-loader.ts)",
"category": "permissions",
"severity": "medium",
"confidence": "heuristic",
"description": "In the server's implementation (`src/lib/node-loader.ts:87`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.",
"remediation": "Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.",
"location": {
"kind": "server",
"name": "src/lib/node-loader.ts"
},
"evidence": "onst nodeModule = await import(nodeModulePath); // Get the default export (the node class) const NodeClass = no",
"owasp": "LLM05:2025 Improper Output Handling",
"data": {
"rule": "MTC-SRC-005",
"file": "src/lib/node-loader.ts",
"line": 87,
"nonRuntime": false
}
}
],
"toxicFlows": [],
"capabilities": [
{
"tool": "n8n-workflow-expert",
"tags": [],
"reasons": {}
},
{
"tool": "task",
"tags": [],
"reasons": {}
},
{
"tool": "Email to Slack Workflow Example",
"tags": [],
"reasons": {}
},
{
"tool": "AI Agent Workflow Example",
"tags": [],
"reasons": {}
},
{
"tool": "Workflow Templates Library",
"tags": [
"untrusted-input"
],
"reasons": {
"untrusted-input": [
"keyword \"browse\""
]
}
},
{
"tool": "build_workflow",
"tags": [],
"reasons": {}
},
{
"tool": "add_node",
"tags": [],
"reasons": {}
},
{
"tool": "edit_node",
"tags": [],
"reasons": {}
},
{
"tool": "delete_node",
"tags": [],
"reasons": {}
},
{
"tool": "add_connection",
"tags": [],
"reasons": {}
},
{
"tool": "get_workflow_details",
"tags": [],
"reasons": {}
},
{
"tool": "validate_workflow",
"tags": [],
"reasons": {}
},
{
"tool": "extract_workflow_json",
"tags": [],
"reasons": {}
},
{
"tool": "suggest_architecture",
"tags": [],
"reasons": {}
},
{
"tool": "suggest_nodes",
"tags": [],
"reasons": {}
},
{
"tool": "analyze_workflow",
"tags": [],
"reasons": {}
},
{
"tool": "suggest_improvements",
"tags": [],
"reasons": {}
},
{
"tool": "explain_workflow",
"tags": [],
"reasons": {}
},
{
"tool": "search_nodes",
"tags": [],
"reasons": {}
},
{
"tool": "list_nodes_by_category",
"tags": [],
"reasons": {}
},
{
"tool": "get_node_details",
"tags": [],
"reasons": {}
},
{
"tool": "test_workflow",
"tags": [],
"reasons": {}
},
{
"tool": "scan_security",
"tags": [],
"reasons": {}
},
{
"tool": "analyze_performance",
"tags": [],
"reasons": {}
},
{
"tool": "list_templates",
"tags": [],
"reasons": {}
},
{
"tool": "get_template",
"tags": [],
"reasons": {}
},
{
"tool": "search_templates",
"tags": [],
"reasons": {}
},
{
"tool": "fix_json",
"tags": [],
"reasons": {}
}
],
"surfaceDigest": "d3a2d1b5ff445a49d68178fc2546bf06a084775c3266091bf8d9d9b6b501ee2c",
"stats": {
"tools": 28,
"prompts": 0,
"resources": 0,
"findingsBySeverity": {
"critical": 0,
"high": 4,
"medium": 4,
"low": 0,
"info": 0
}
}
}