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Security audit

Xueersi English Grammar Checker

Security checks for vulnerabilities and agentic risk

Overview

This is a simple English grammar-checking skill with no code execution, persistence, credential access, or hidden data handling.

Before installing, users should know this skill may choose Chinese explanations for inferred elementary-grade writing; request English, Chinese, or bilingual explanations explicitly if language preference matters.

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
  • 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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
Findings (1)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The markdown specifies that for elementary grades the skill should 'explain in Chinese,' which imposes a language choice based on inferred user level rather than explicit user preference. This is a natural-language policy issue because the skill mandates a specific language/locale behavior without offering opt-in or choice.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.