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Security audit

Adyen

Security checks for vulnerabilities and agentic risk

Overview

The Adyen read workflow is coherent, but its automatic setup can execute unverified remote code without clear user approval.

Review and install the CLI yourself before enabling this skill, including any additional agent skills it installs. Require approval for subsequent software installation and connect only the Adyen account permissions needed. Remote installer and hosted connector implementations were unavailable for verification; no malicious behavior was established in the submitted artifact.

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
Vulnerability Patterns
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command does not demonstrate any Adyen-related functionality. Instead, it executes an externally hosted installer, an undeclared capability with potential local system effects. Nothing in the supplied chunk establishes that this installation is a supporting implementation detail for Adyen access. The remote script's contents and precise effects are not available for inspection.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a live HTTPS response directly into Bash executes mutable remote code without independent integrity verification or an opportunity to inspect it. Compromise of the installer distribution infrastructure could yield arbitrary execution with the invoking process's privileges; the PowerShell example has the same weakness, although both paths are limited to first-time setup.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

The setup workflow instructs the agent to execute downloaded installation scripts without warning the user about the system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The missing-CLI fallback directs the agent to install software without first obtaining approval for local system changes and remote code execution. Although conditional setup reduces exposure, authorization to read Adyen data does not necessarily authorize running an installer with the agent's local privileges.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 81)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources