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Security audit

Mx Select Stock

Security checks for vulnerabilities and agentic risk

Overview

This skill transparently uses a stock-screening API to fetch current market screening results, with no hidden code execution or persistence found.

Before installing, understand that your stock-screening query and API key will be sent to the Meixiang endpoint shown in the skill. Do not include secrets, proprietary strategy text, or unrelated confidential information in the keyword; expect returned tables to use Chinese column headers unless you ask the agent to translate them afterward.

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)

Natural-Language Policy Violations

Medium
Confidence
93% confidence
Finding
The overview states that the skill returns a full data table with Chinese column headers, which imposes a specific language/locale behavior. The file does not indicate that users can opt into another language or choose their preferred output locale.

External Transmission

Medium
Category
Data Exfiltration
Content
- `pageSize` – number of rows per page (max 100, adjust as needed)
2. **Execute the POST request**:
   ```bash
   curl -X POST \
     --location 'https://mkapi2.dfcfs.com/finskillshub/api/claw/stock-screen' \
     --header 'Content-Type: application/json' \
     --header "apikey:${MX_APIKEY}" \
Confidence
89% confidence
Finding
The skill instructs sending user-provided screening queries to an external third-party API along with an API key, which is an external data transmission path. While this is expected for the skill’s function, it can expose sensitive user financial interests, proprietary screening logic, or internal prompts if users submit confidential content as the keyword.

Static analysis

No suspicious patterns detected.