# A05 Security Misconfiguration

> Skills for exploiting security misconfigurations including XXE, file upload, subdomain takeover, and cache issues per OWASP A05:2021. Use when this capability is needed.

- Skill: `tomevault-io/a05-security-misconfiguration` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/a05-security-misconfiguration`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/a05-security-misconfiguration/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/a05-security-misconfiguration

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# Security Misconfiguration (OWASP A05)

Missing or improperly configured security controls at any level of the application stack.

## Skills

- [XXE](references/xxe.md) - XML External Entity injection
- [File Upload](references/file-upload.md) - Unrestricted file upload exploitation
- [Subdomain Takeover](references/subdomain-takeover.md) - Dangling DNS exploitation
- [Cache Deception](references/cache-deception.md) - Web cache poisoning attacks

## Quick Reference

| Attack | Target | Impact |
|--------|--------|--------|
| XXE | XML parsers | File read, SSRF, RCE |
| File Upload | Upload endpoints | Webshell, RCE |
| Subdomain Takeover | Dangling DNS | Phishing, cookies |
| Cache Deception | CDN/proxy | Data theft |

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