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Security audit

UI Design

Security checks for vulnerabilities and agentic risk

Overview

The skill itself is ordinary UI design guidance, but its documented install command uses an unpinned executable installer and a mutable remote source that users should review before running.

Review the skill content as normal UI design guidance, but avoid running the documented `npx add` command unless you trust the installer and source. Prefer installing from a pinned package version or immutable commit, and run installation without elevated privileges or unrelated credentials in the environment.

A.I.G

Vulnerability Patterns
  • Insecure DependenciesIntroduces malicious components through unsafe dependency sources
  • 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
Findings (1)

T08 · Insecure Dependencies

Warning
Location
README.md:28
Finding

Unpinned Third-Party Installer and Mutable Remote Source

Content
View full analysis
Remediation
View remediation

SkillSpector

Vulnerability Patterns
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Memory PoisoningPersistent Context Injection, Context Window Stuffing, Memory Manipulation
  • Rogue AgentSelf-Modification, Session Persistence
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
Findings (8)

Memory Manipulation

High
Category
Memory Poisoning
Confidence
80% confidence
Finding

Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.

Content

Scanner excerpt · SKILL.md (reported line 381)May include surrounding context.

md
## Component States

Every interactive element needs clear states.

| State | Visual Treatment |
|-------|------------------|

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Session Persistence

Medium
Category
Rogue Agent
Confidence
60% confidence
Finding

Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Content

Scanner excerpt · README.md (reported line 41)May include surrounding context.

From your project root:

bash
mkdir -p .cursor/skills
cp -r ~/.ai-skills/skills/design-systems/ui-design .cursor/skills/ui-design

Skill Enumeration

Medium
Category
Agent Snooping
Confidence
85% 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 57)May include surrounding context.

From your project root:

bash
mkdir -p .claude/skills
cp -r ~/.ai-skills/skills/design-systems/ui-design .claude/skills/ui-design

Skill Enumeration

Medium
Category
Agent Snooping
Confidence
85% 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 64)May include surrounding context.

Claude Code (global)

bash
mkdir -p ~/.claude/skills
cp -r ~/.ai-skills/skills/design-systems/ui-design ~/.claude/skills/ui-design

External Model or Provider Selection

Medium
Category
Excessive Agency
Confidence
90% confidence
Finding

Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.

Content

Scanner excerpt · SKILL.md (reported line 3)May include surrounding context.

md
---
name: ui-design
model: standard
version: 1.0.0
description: >
  Comprehensive UI design skill covering fundamentals, patterns, and anti-patterns.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
90% confidence
Finding

The description says to use the skill when building 'any web interface,' which is a very broad condition rather than a narrowly scoped trigger. Without clearer constraints or exclusion examples, this could cause the skill to be invoked for routine frontend tasks where specialized UI-design guidance was not specifically intended.

Content

No source excerpt is available for this finding.

Vague Triggers

Low
Category
Not specified by scanner
Confidence
86% confidence
Finding

The KEYWORDS section contains many generic terms like 'frontend,' 'layout,' and 'accessibility' that commonly appear in everyday development contexts. Because the file does not pair these with tighter trigger constraints or negative examples, the skill may match more conversations than intended.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.