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Security audit

exotic-weekend-planner

Security checks for vulnerabilities and agentic risk

Overview

The skill uses CarRentalList to find rental cars and plan drives, with search criteria and driver age used for relevant filtering.

Expect your search criteria and driver age to be sent to CarRentalList. Check its privacy practices and request the missing reference documents. Confirm availability, fees and rental terms directly before booking.

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
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • 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 (2)

MCP Config Access

High
Category
Agent Snooping
Confidence
80% confidence
Finding

Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.

Content

Scanner excerpt · SKILL.md (reported line 10)May include surrounding context.

md
Turn "I want to drive something special this weekend" into a plan: which car,
from whom, delivered where, which roads, how many miles against what is
included, and what it costs. The CarRentalList MCP server ships a prompt for the
same job (`plan_exotic_weekend`); this skill is its full version for agents
without prompts.

The workflow sends the user's driver age and search preferences to CarRentalList without a user-facing privacy notice.

Medium
Category
Output Handling
Confidence
90% confidence
Finding

The workflow instructs the agent to pass location, budget, vehicle preferences, and driver age (as max_min_age) to the CarRentalList tools. Although the external MCP server is named, the skill never instructs the agent to warn the user that their information will be transmitted to that service.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.