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Security audit

Open Exchange Rate

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward exchange-rate helper that contacts a public currency API only when the user asks for rates or conversions.

Before installing, understand that the skill runs Python scripts using the requests library and makes outbound calls to open.er-api.com when invoked. It does not require an API key or access local secrets, but users who need strict network allowlisting may want explicit permission metadata or endpoint documentation added.

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 Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • 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)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
95% confidence
Finding

The skill invokes network-capable scripts but does not declare any explicit tool scope such as permissions or allowed-tools. This creates a transparency and policy gap: an agent or reviewer cannot easily determine or constrain the skill's external connectivity, increasing the risk of unintended outbound requests, data exposure, or abuse if the scripts are modified or called in unexpected contexts.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.