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Security audit

Markdown Browser

Security checks for vulnerabilities and agentic risk

Overview

This skill coherently post-processes official web fetch results and does not show hidden execution, exfiltration, persistence, or destructive behavior.

Users should be comfortable allowing this skill to process fetched page content and run a local Node script. For stronger supply-chain control, install from a reviewed lockfile or pin the turndown dependency before use.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • 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
Findings (2)

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
70% confidence
Finding

Without declared permissions the skill's intent is opaque and cannot be validated.

Content

No source excerpt is available for this finding.

Unpinned Dependencies

Low
Category
Supply Chain
Confidence
95% confidence
Finding

The dependency uses a caret range (^7.2.2), which permits automatic installation of newer compatible versions rather than a single exact version. This can introduce supply-chain risk if a future release in that range is compromised or contains a breaking security issue, though the package shown is common and the file itself does not indicate overtly malicious intent.

Content

Scanner excerpt · package.json (reported line 1)May include surrounding context.

json
{"type":"module","dependencies":{"turndown":"^7.2.2"}}

Static analysis

No suspicious patterns detected.