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Security audit

Openrouter Free Responder

Security checks for vulnerabilities and agentic risk

Overview

This skill does what it says: it sends user prompts to OpenRouter free models using an OpenRouter API key, with no hidden persistence or unrelated behavior found.

Install only if you are comfortable sending the prompts you use with this skill, and any optional system guidance, to OpenRouter and downstream model providers. Do not use it with secrets or private data unless that matches your OpenRouter data-handling expectations.

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
  • System Prompt LeakageDirect Leakage, Indirect Extraction, Tool-Based Exfiltration
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Direct Prompt Extraction

High
Category
System Prompt Leakage
Confidence
85% confidence
Finding

Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.

Content

Scanner excerpt · scripts/openrouter_free_chat.py (reported line 57)May include surrounding context.

python
completion = as_decimal(pricing.get("completion"))
    if prompt is None or completion is None:
        return False
    return prompt == Decimal("0") and completion == Decimal("0")


def get_context_score(context_length: Any) -> int:

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
96% confidence
Finding

The skill invokes a Python script that requires an API key from the environment and makes outbound network requests, but the manifest does not declare any tool scope such as permissions or allowed-tools. That mismatch reduces transparency and weakens policy enforcement, making it easier for a caller to invoke code with broader capabilities than reviewers or runtime controls expect.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The script sends the user-provided prompt and optional system instruction directly to OpenRouter-hosted third-party models, but the script itself provides no explicit user-facing disclosure, consent prompt, or warning at the point of transmission. In a skill whose purpose is external LLM routing, this is expected behavior, but it still creates a real privacy and data-handling risk if callers assume prompts stay local or may include secrets.

Content

No source excerpt is available for this finding.