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Security audit

Web Workers

Security checks for vulnerabilities and agentic risk

Overview

This skill is a focused Web Workers guidance package with no executable code, persistence, hidden data access, or unsafe install behavior.

Before installing, understand that this skill provides implementation guidance for moving expensive browser work into Web Workers. Review generated worker code for normal frontend concerns such as CSP, lifecycle cleanup, cancellation, and data transfer behavior.

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
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (3)

Skill Enumeration

Medium
Category
Agent Snooping
Confidence
80% confidence
Finding

Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Content

Scanner excerpt · README.md (reported line 10)May include surrounding context.

md
- ID: `fec-web-workers`
- Category: `implementation-capability`
- Version: `2.9.0`
- Source: `skills/fec-web-workers/SKILL.md`

## Description

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
78% confidence
Finding

The README explicitly states that Chinese triggers include certain terms, which introduces a language-specific activation policy in natural-language documentation. Because the file does not indicate that language choice is optional or that other locales are equally supported, this can be read as a locale/language policy preference without user opt-in.

Content

No source excerpt is available for this finding.

Natural-Language Policy Violations

Low
Category
Not specified by scanner
Confidence
91% confidence
Finding

The package description states that 'Chinese triggers include Web Worker, background thread, main thread blocking,' which embeds a locale/language-specific activation policy in natural language. This specifies a language context without indicating that users can choose or opt into that locale behavior.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.