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Security audit

Java Toolkit Free

Security checks for vulnerabilities and agentic risk

Overview

This Java checklist skill is not clearly malicious, but it requests read/exec/write authority and includes broad modify/delete/deployment/network instructions that are not well scoped to its stated code-review purpose.

Review this skill before installing. It appears to be a Java coding checklist, but it asks for broader read/exec/write capabilities and contains vague state-changing and network-troubleshooting instructions. Only use it where you are comfortable with an agent potentially running commands or writing files, and prefer a version that narrows activation to Java code review and removes delete/reset/deployment/network guidance.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Behavioral ASTexec() Call, eval() Call, Dynamic Import
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill advertises create, modify, delete, save, export, import, and reset style operations through parameters and output handling, but provides no warnings or restrictions around file or system impact. In combination with declared read/exec/write tools, this creates a plausible path for destructive or unauthorized state changes that are unrelated to a passive Java rule-checking tool.

Content

No source excerpt is available for this finding.

Intent-Code Divergence

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The skill states it is not suitable for operations or deployment management, yet later introduces command-line execution and network diagnostic guidance such as ping-based troubleshooting. This mismatch can mislead users and agents about the skill’s actual behavior boundary, increasing the chance that an agent invokes operational commands outside the intended Java self-check scope.

Content

No source excerpt is available for this finding.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

The trigger condition covers broad activities like code generation, programming assistance, debugging, testing, and deployment, which far exceed the stated purpose of checking 14 Java pitfalls. Overbroad activation makes it easier for the skill to be invoked in unrelated contexts where its write/exec capabilities could have unintended side effects.

Content

No source excerpt is available for this finding.

Context-Inappropriate Capability

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

For a skill advertised as a Java coding rules checklist, enabling exec-driven command execution and network diagnostics is unnecessary and expands the attack surface significantly. An attacker or prompt-injected user input could leverage this mismatch to trigger shell commands or external connectivity under the guise of code assistance.

Content

No source excerpt is available for this finding.