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Security audit

Reddit (read only - no auth)

Security checks for vulnerabilities and agentic risk

Overview

This skill is a read-only Reddit browsing helper that fetches public Reddit JSON and does not show evidence of posting, credential use, persistence, or local data access.

Install this only if you are comfortable with an agent fetching public Reddit content through a bundled Node script. It should not need Reddit credentials or permission to post; keep usage user-directed and avoid adding auth cookies or tokens unless the skill is redesigned and re-reviewed.

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
91% confidence
Finding

The skill invokes a Node script that performs outbound network access to Reddit and accepts environment-based configuration, but the manifest does not declare any explicit tool scope such as allowed tools or permissions. That mismatch weakens sandboxing and review controls because an agent/runtime may grant broader capabilities than readers expect, making it easier for future changes or hidden behavior to use network or environment access without clear authorization.

Content

No source excerpt is available for this finding.

Static analysis

Detected: suspicious.env_credential_access

Environment variable access combined with network send.

Critical
Code
suspicious.env_credential_access
Location
scripts/reddit-readonly.mjs:16