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Security audit

groupon-mcp

Security checks for vulnerabilities and agentic risk

Overview

This skill is a small, disclosed set of instructions for querying public Groupon deal data and does not show hidden credential use, persistence, or unrelated data access.

Before installing, understand that searches and city/deal parameters will be sent to Groupon. Do not add account cookies, payment data, or other private information to these curl examples; use it only for public deal browsing.

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)

External Transmission

Medium
Category
Data Exfiltration
Content
# Groupon curl recipes

All hit `POST https://www.groupon.com/mobilenextapi/graphql` with headers
`content-type: application/json` and `apollographql-client-name: mobilenextapi`.
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.