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Security audit

HuDy

Security checks for vulnerabilities and agentic risk

Overview

This skill is a straightforward HuDy MCP integration for Korean holiday and business-day queries, with disclosed custom-holiday write tools that users should invoke carefully.

Install only if you intend to use HuDy and are comfortable sending holiday/business-day requests to its MCP service with your API key. Treat create, update, and delete custom-holiday requests as account changes: ask the agent to summarize the exact holiday record before making or deleting it.

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
  • 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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

Missing User Warnings

Medium
Confidence
92% confidence
Finding
The skill exposes state-changing operations for creating, updating, and deleting custom holidays, but it does not warn that these actions persist user data or recommend confirmation before executing them. In an agent context, ambiguous natural-language requests could cause unintended modification or deletion of user-maintained calendar/business-day configuration, leading to incorrect downstream scheduling and loss of user data integrity.