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Security audit

OpenCode Game Builder

Security checks for vulnerabilities and agentic risk

Overview

This skill is a coding-agent launcher whose powerful file, shell, and git access is disclosed but too broadly triggered and weakly scoped for automatic use.

Install only if you are comfortable with a skill that may delegate coding tasks to OpenCode with read/write file access, shell commands, and git operations. Use it in trusted project directories, avoid ambiguous prompts, and review spawned-agent actions before allowing changes to important repositories or sensitive files.

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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
96% confidence
Finding

The activation text is broad enough to trigger on many ordinary coding requests, which can cause the system to invoke a powerful coding subagent when the user did not explicitly request it. In this skill, that risk is amplified because the subagent is described as having file-system and shell access, so an over-broad trigger can expand the scope of actions taken on the host environment.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The skill explicitly advertises full file-system and shell access but does not pair that capability with clear safety constraints, consent requirements, or warnings about destructive/system-impacting behavior. In the context of an auto-triggerable coding agent, this creates a real risk of unintended file changes, command execution, credential exposure, or broader workstation compromise if the skill is invoked on untrusted or ambiguous tasks.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.