Security audit

x402-discovery

Security checks for vulnerabilities and agentic risk

Overview

This skill is a small discovery guide that tells agents how to query public x402 service catalogs and does not include hidden code, credential handling, persistence, or destructive behavior.

Installers should be comfortable with the skill making network requests to public x402 catalogs and individual service manifest URLs. Avoid pasting secrets into discovery URLs, and review any discovered paid service before using or paying for it.

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
Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep

Findings (2)

External Transmission

Medium

Category: Data Exfiltration
Confidence: 50% 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 28)May include surrounding context.
The x402 Foundation's discovery layer. Facilitators publish /discovery/resources endpoints:

bash
curl -s https://api.cdp.coinbase.com/x402/discovery/resources

Returns all x402-compatible services registered through the facilitator, with full pricing, schemas, and metadata.

External Transmission

Medium

Category: Data Exfiltration
Confidence: 50% 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 39)May include surrounding context.
The x402 Foundation's discovery layer. Facilitators publish /discovery/resources endpoints:

bash
curl -s https://api.cdp.coinbase.com/x402/discovery/resources

Returns all x402-compatible services registered through the facilitator, with full pricing, schemas, and metadata.