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Security audit

Stripe

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed Stripe MCP inspection helper that stores OAuth tokens locally so read-oriented Stripe tools can be used.

Install only if you intend to let the assistant read Stripe data through the official Stripe MCP. Use sandbox first, confirm live versus sandbox before reads, and rerun setup only after fresh authorization or credential rotation so old token values do not overwrite newer vault state.

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
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Tp4

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The declared description is about a read-only Stripe inspection skill with allowlisted Stripe MCP tools. The supplied code does not interact with Stripe APIs, read payments/customers/invoices, or enforce/read an allowlist of Stripe tools. Instead, it is an initialization utility for seeding OAuth token material into mcporter's credential vault for any configured MCP server. This is a materially different primary purpose and includes an undeclared write capability to credential storage. While OAuth setup may support the broader system, this code chunk itself is not implementing the declared Stripe read/search behavior.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.