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Security audit

sold-price-comps

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed paid MCP integration for product price comps, with no local code execution or hidden system access found.

Before installing, confirm you are comfortable with a third-party MCP server receiving your product queries, logging each call, and charging $0.05 per paid x402 call on capable clients. Treat results marked data_type "active" as asking-price comps, not confirmed sale prices.

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
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (4)

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 · README.md (reported line 25)May include surrounding context.

md
{
  "mcpServers": {
    "sold-price-comps": {
      "url": "https://api.3rdplaceprovisions.com/mcp"
    }
  }
}

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 24)May include surrounding context.

md
{
  "mcpServers": {
    "sold-price-comps": {
      "url": "https://api.3rdplaceprovisions.com/mcp"
    }
  }
}

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The skill discloses paid usage and server-side logging only later in the document, not prominently at the point users decide to install or invoke it. In an agent setting, this can cause users or downstream agents to trigger automatic paid transactions and transmit query data to a third party without sufficiently clear, upfront consent or awareness.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The example response contradicts the skill’s stated purpose of returning recent sold-price comps by providing active listings with asking prices instead. This can mislead downstream agents or users into treating unsold listing prices as market-clearing sale values, causing inaccurate valuation, pricing, or purchasing decisions.

Content

No source excerpt is available for this finding.