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Security audit

Reddit (read only - no auth)

Security checks for vulnerabilities and agentic risk

Overview

This skill is a narrow read-only Reddit browser that fetches public posts and comments without posting, storing data, or using credentials.

Install this only if you are comfortable letting the agent fetch public Reddit content from user-specified subreddits and searches. Keep use scoped with small limits, and review any drafted replies yourself because the skill intentionally does not post or vote for you.

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
90% confidence
Finding

The skill invokes a Node script that uses network access to Reddit and supports environment-based runtime configuration, but the manifest does not declare any explicit tool scope or permissions boundary. This creates a governance and least-privilege gap: an agent/runtime may grant broader capabilities than reviewers expect, making it harder to reason about what the skill is allowed to access or exfiltrate if the implementation changes or is compromised.

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