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Security audit

HN Morning Brief

Security checks for vulnerabilities and agentic risk

Overview

This skill fetches and summarizes Hacker News stories in a way that matches its stated purpose, with no evidence of hidden persistence, credential use, or destructive behavior.

Install this if you are comfortable with the agent using stored interest/preferences memory to rank Hacker News stories and opening article URLs from HN when you ask for summaries. No hidden credential use, persistence, or destructive actions were found.

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 Python script to fetch Hacker News stories and later instructs the agent to read article URLs, which implies outbound network access, but the manifest does not declare an explicit tool scope such as permissions or allowed-tools. This creates an authorization gap: the runtime may permit broader network/tool use than intended, reducing least-privilege guarantees and making review and enforcement harder.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.