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Security audit

NASDAQ Public API CLI

Security checks for vulnerabilities and agentic risk

Overview

This skill is a small Nasdaq screener helper that makes disclosed requests to Nasdaq and does not show hidden persistence, credential access, or destructive behavior.

Install only if you are comfortable with a skill that can make outbound requests to Nasdaq when invoked. Treat the screener endpoint as public web behavior that may change, and review Nasdaq's terms and rate limits for your use case.

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
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • 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 (5)

Tp4

High
Category
MCP Tool Poisoning
Confidence
91% confidence
Finding
The skill description claims broader Nasdaq API coverage and official Nasdaq Data Link guidance, while the documented implementation appears limited to a specific screener endpoint and local reference material. This mismatch is dangerous because agents or users may trust the declared scope and make security or operational decisions based on capabilities the skill does not actually implement or validate.

Lp3

Medium
Category
MCP Least Privilege
Confidence
88% confidence
Finding
The skill advertises and relies on shell execution via a bundled script, but the manifest shown in SKILL.md does not declare any explicit tool scope or permissions boundary. In agent environments, missing tool scoping can cause overbroad execution capability, making it harder to enforce least privilege and increasing the chance that the skill is invoked with unintended shell access.

External Transmission

Medium
Category
Data Exfiltration
Content
#!/usr/bin/env bash
set -euo pipefail

BASE_URL="https://api.nasdaq.com/api/screener/stocks"
USER_AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
ACCEPT="application/json, text/plain, */*"
REFERER="https://www.nasdaq.com/market-activity/stocks/screener"
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
#!/usr/bin/env bash
set -euo pipefail

BASE_URL="https://api.nasdaq.com/api/screener/stocks"
USER_AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
ACCEPT="application/json, text/plain, */*"
REFERER="https://www.nasdaq.com/market-activity/stocks/screener"
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

External Transmission

Medium
Category
Data Exfiltration
Content
#!/usr/bin/env bash
set -euo pipefail

BASE_URL="https://api.nasdaq.com/api/screener/stocks"
USER_AGENT="Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
ACCEPT="application/json, text/plain, */*"
REFERER="https://www.nasdaq.com/market-activity/stocks/screener"
Confidence
60% confidence
Finding
Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Static analysis

No suspicious patterns detected.