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Security audit

English Homework Grader (G3-6)

Security checks for vulnerabilities and agentic risk

Overview

This is a prompt-only English homework grading skill with no code execution, persistence, credential use, or hidden data flow.

Installers should expect this skill to answer homework-grading feedback mostly in Chinese. It appears safe for normal use, but users wanting another language should explicitly request that in their prompt.

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
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 (2)

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The prompt instructions require explanations and closing messages in Chinese, and later sections reinforce Chinese as the required explanation language. This is a natural-language locale constraint presented as mandatory behavior, with no opt-in or alternative for users who may prefer another language.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The required output headings are in Chinese and the general principles state 'Use Chinese for explanations,' making a specific language mandatory across the skill. Because the file does not offer a user choice or clearly justify the constraint as an explicit regional-only tool policy, this is a policy-relevant language restriction.

Content

No source excerpt is available for this finding.