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Security audit

a2a-Market-Stripe-Payment

Security checks for vulnerabilities and agentic risk

Overview

This is a disclosed Stripe payment-integration skill with financial impact, but the reviewed package is only markdown guidance and does not include hidden execution, persistence, or credential-handling behavior.

Install only if you intend to build Stripe-backed order payments. Before using it against real accounts, confirm whether credentials are test or live, require explicit review before capture/refund/cancel actions, and keep webhook signature verification plus idempotency controls in place.

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 (1)

Missing User Warnings

Medium
Confidence
88% confidence
Finding
This markdown file describes a payment integration that can create intents, capture funds, cancel authorizations, and reconcile webhook-driven state changes, all of which can affect user money and order integrity. Under the markdown-specific warning rule, the description should explicitly disclose these impactful behaviors rather than only listing them as scope.

Static analysis

No suspicious patterns detected.