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Security audit

YouTube Shorts Search by Gecho

Security checks for vulnerabilities and agentic risk

Overview

The skill’s YouTube Shorts purpose is clear, but its setup runs an unpinned internet-downloaded MCP package and relies on a logged-in browser session, so it should be reviewed before installation.

Install only if you trust Gecho Bridge, the Chrome extension, and their access to your logged-in YouTube browser session. Prefer an exact pinned MCP package version or the managed bundle plugin, review extension permissions, and consider using a separate browser profile/account for research workflows.

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
  • System Prompt LeakageDirect Leakage, Indirect Extraction, Tool-Based Exfiltration
  • 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 (2)

Direct Prompt Extraction

High
Category
System Prompt Leakage
Confidence
85% confidence
Finding

Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.

Content

Scanner excerpt · SKILL.md (reported line 282)May include surrounding context.

md
Join the [WeCom group](https://github.com/gecho-ai/gecho-bridge/blob/main/qywx.jpg) or use the [1:1 support QR code](https://github.com/gecho-ai/gecho-bridge/blob/main/wx.jpg).

## Output guidelines

Successful runs should:

Rp1

Medium
Category
MCP Rug Pull
Confidence
97% confidence
Finding

The skill instructs users to launch an MCP server via npx ...@latest, which pulls and executes the newest package version at runtime without pinning or integrity control. This creates a software supply-chain risk: a compromised upstream package, malicious update, or account takeover could cause arbitrary code execution in the user's environment when they follow the setup instructions.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.