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Security audit

onthecheap-mcp

Security checks for vulnerabilities and agentic risk

Overview

This skill is a read-only guide for finding public free and cheap local events, with no credential use, persistence, or destructive behavior in the inspected artifact.

Before installing, understand that this skill is meant to retrieve public event and deal information from On the Cheap city sites. It appears low risk from the inspected artifact, but results come from external public websites and should be checked for current availability before relying on event times, prices, or offers.

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

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
75% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

md
## Response shape (`view`)

`otc_search_posts` takes `view: "compact" | "full"`, and **`compact` is the
default** — you get the slim shape without asking. It is the only tool here
that takes one; the other seven are covered at the end of this section.

Compact projects each result down to the fields a caller ranks or browses on:

Static analysis

No suspicious patterns detected.