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Security audit

wechat-mp-writer-skill-mxx

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed WeChat public-account writing helper with optional draft-box publishing, and I found no hidden execution, persistence, or unrelated data access.

Install this if you want a Chinese WeChat public-account writing workflow. Before using the publish feature, confirm which WeChat account will receive the draft and avoid sending confidential, personal, or unpublished business content unless you are comfortable placing it in WeChat's draft system.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (3)

Natural-Language Policy Violations

Medium
Confidence
87% confidence
Finding
The description presents the skill entirely as a WeChat public-account writing assistant for Chinese content and does not mention any user opt-in or language selection. This can violate language/locale policy when a skill forces a specific language behavior without giving the user a choice or clearly documenting the restriction.

Missing User Warnings

Medium
Confidence
94% confidence
Finding
The skill offers publishing article content to a WeChat public account draft box but does not warn the user that their generated or supplied content will be transmitted to an external platform. This creates a privacy and unintended-disclosure risk, especially if drafts contain confidential business information, unpublished material, or personal data.

Missing User Warnings

Medium
Confidence
97% confidence
Finding
The tool-calling instructions say to pass generated Markdown to `wechat-mp-publisher` for publication without requiring user confirmation first. This is dangerous because it can cause accidental external transmission or publication of content the user only intended to draft, review, or locally edit.

Static analysis

No suspicious patterns detected.