# A04 Insecure Design

> Skills for exploiting insecure design patterns including race conditions and parameter pollution per OWASP A04:2021.

- Skill: `omkar-ukirde/a04-insecure-design` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add omkar-ukirde/a04-insecure-design`
- Raw SKILL.md: https://api.skillmd.com/api/skills/omkar-ukirde/a04-insecure-design/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: omkar-ukirde (https://skillmd.com/u/omkar-ukirde)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/omkar-ukirde/a04-insecure-design

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# Insecure Design (OWASP A04)

Flaws in design and architecture that cannot be fixed by proper implementation.

## Skills

- [Race Condition](references/race-condition.md) - Timing-based exploitation
- [Parameter Pollution](references/parameter-pollution.md) - HTTP parameter manipulation

## Quick Reference

| Attack | Target | Technique |
|--------|--------|-----------|
| Race Condition | Financial, limits | Parallel requests |
| HPP | WAF bypass, logic | Duplicate parameters |