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Security audit

Cmc X402

Security checks for vulnerabilities and agentic risk

Overview

This is a disclosed CoinMarketCap x402 payment guide, but it should be reviewed because it teaches automatic wallet-backed payments with broad triggers and no enforced spending policy.

Use this only with a dedicated low-balance Base wallet, pin and verify npm package versions, and add explicit checks for chain, USDC contract, recipient, price, retries, and cumulative spend before allowing automatic payments.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
Findings (2)

T08 · Insecure Dependencies

Warning
Location
SKILL.md:56
Finding

Unpinned Wallet-Capable npm Dependencies

Content
View full analysis
Remediation
View remediation

T09 · Insecure Skill Coding Practices

Warning
Location
SKILL.md:62
Finding

Automatic Payment Signer Lacks Explicit Transaction Policy Enforcement

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The trigger list and description are broad enough to match generic terms like "no API key," "USDC payment," and even broad "Coinbase x402 protocol questions," which can cause the skill to be invoked outside its intended CoinMarketCap x402 scope. Over-broad invocation increases the chance an agent routes unrelated financial or payment requests into this skill, leading to incorrect actions, unnecessary paid requests, or exposure of wallet/payment workflow guidance in inappropriate contexts.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · references/payment-details.md (reported line 72)May include surrounding context.

version: "2"

text

## Manual Flow with curl

```bash
# Step 1: Get the 402 response with payment requirements