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Security audit

x402-endpoint-validator

Security checks for vulnerabilities and agentic risk

Overview

This skill is a small documentation-style validator that uses explicit curl examples to test user-selected x402 endpoints, with no hidden code execution or persistence.

Installers should understand that using the skill will make HTTP requests to the endpoints they choose to validate. Avoid including secrets, private customer data, or production-only payloads in test requests unless that is intended.

A.I.G

Vulnerability Patterns
  • 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
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (3)

External Script Fetching

High
Category
Supply Chain
Confidence
90% confidence
Finding

Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.

Content

Scanner excerpt · SKILL.md (reported line 29)May include surrounding context.

bash
# Trigger a 402 (replace URL and body with the service's expected input)
curl -s -o /dev/null -w "%{http_code}" -X POST https://service.example/services/your-endpoint/jobs \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.de"}'

External Script Fetching

High
Category
Supply Chain
Confidence
90% confidence
Finding

Remote code is downloaded and executed. This bypasses code review and could introduce malicious code.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

Validate Well-Known Manifest

bash
curl -s https://service.example/.well-known/x402 | python3 -m json.tool

Check:

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 · SKILL.md (reported line 29)May include surrounding context.

bash
# Trigger a 402 (replace URL and body with the service's expected input)
curl -s -o /dev/null -w "%{http_code}" -X POST https://service.example/services/your-endpoint/jobs \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.de"}'

Static analysis

No suspicious patterns detected.