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Security audit

yahoo fetch data of stonks

Security checks for vulnerabilities and agentic risk

Overview

This skill does what it says: it fetches stock quote data from Yahoo Finance and returns normalized JSON.

Before installing, be aware that any ticker symbols you ask about will be sent to Yahoo Finance. This is expected for the skill's function; users who require strict outbound-domain controls should verify the runtime can restrict it to the Yahoo quote endpoint.

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
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
93% confidence
Finding

The skill advertises network-backed functionality via the Yahoo Finance endpoint, but it does not declare any explicit tool scope such as permissions or allowed-tools. That mismatch weakens least-privilege controls and can let a reviewer or runtime underappreciate that the skill performs external network access, which is especially risky in user-invocable skills because external requests can expose user-provided data or be repurposed if implementation changes.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.