Back to skill

Security audit

LurkAPI: Reddit research

Security checks for vulnerabilities and agentic risk

Overview

The skill provides a proportionate Reddit research workflow through LurkAPI, with an unrelated TikTok example and ordinary query-privacy considerations.

LurkAPI receives your search wording and consumes API credits, so omit confidential details and check current charges. Keep the key in your environment and skip the unrelated TikTok example. The review covers the bundled instructions; linked endpoint documentation and live service behavior remain unverified.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • 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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command accesses TikTok profile data, an inconsistent resource and materially different operation from the declared Reddit voice-of-customer research. No Reddit search, thread or comment retrieval, or opinion analysis is shown. The API key is an authentication implementation detail, not a separate mismatch.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 18)May include surrounding context.

Without MCP (Codex, Cursor, scripts), every tool is GET https://api.lurkapi.com plus its path, with the same params as a query string (URL-encoded) and the key from LURKAPI_API_KEY in the x-api-key header:

bash
curl -s "https://api.lurkapi.com/v1/tiktok/profile?handle=nike" -H "x-api-key: $LURKAPI_API_KEY"

If LURKAPI_API_KEY isn't set but LURKAPI_KEY is (the name older docs used), use that. Raw answers are big: pipe them through jq to keep the fields you need. No key yet? Ask the user to create one at https://lurkapi.com/dashboard (100 free credits on sign-up, then a balance below 25 tops back up to 25 every day) and to set LURKAPI_API_KEY in their shell. Never ask for the key in the chat, and never print it.

The workflow sends user-provided research topics and problem descriptions to LurkAPI without a privacy warning.

Medium
Category
Output Handling
Confidence
91% confidence
Finding

The search steps instruct the agent to submit the user's topic and problem wording to LurkAPI, a third-party service. Although the API connection is documented, the skill does not warn that these queries disclose user-provided information, potentially including confidential product or competitor research.

Content

No source excerpt is available for this finding.