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Security audit

Pipeworx wger

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward workout-exercise database connector that sends exercise lookup requests to a disclosed external MCP endpoint.

Before installing, be aware that exercise queries you send through this skill go to the Pipeworx-hosted wger MCP endpoint. Do not include private health details beyond what is needed for exercise lookups unless you are comfortable with that service handling them.

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 (2)

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 15)May include surrounding context.

Example: list exercises

bash
curl -X POST https://gateway.pipeworx.io/wger/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"list_exercises","arguments":{"limit":10}}}'

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
95% confidence
Finding

The natural-language description for list_exercises states "English only," which is a locale/language constraint. The file does not offer users a language choice or explain a justified region-specific reason for this limitation, so it matches the policy-violation criterion for forced language without opt-in.

Content

No source excerpt is available for this finding.