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cors-cross-origin-misconfiguration

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CORS misconfiguration testing playbook. Use when analyzing cross-origin trust, credentialed browser reads, origin reflection, preflight policy bugs, and browser-based access to authenticated APIs.

knowledge/hack-skills/skills/cors-cross-origin-misconfiguration/SKILL.md

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# SKILL: CORS Misconfiguration — Credentialed Origins, Reflection, and Trust Boundary Errors

> **AI LOAD INSTRUCTION**: Use this skill when browsers can access authenticated APIs cross-origin. Focus on reflected origins, credentialed requests, wildcard trust, parser mistakes, and origin allowlist bypasses. For JSONP hijacking deep dives, same-origin policy internals, honeypot de-anonymization, and CORS vs JSONP comparison, load the companion [SCENARIOS.md](./SCENARIOS.md).

### Extended Scenarios

Also load [SCENARIOS.md](./SCENARIOS.md) when you need:
- JSONP hijacking complete attack scenario — watering hole + `<script>` cross-origin data theft
- Honeypot de-anonymization via JSONP — use social platform JSONP endpoints to identify anonymous visitors
- Same-origin policy deep dive — protocol/hostname/port definition, `document.domain` subdomain relaxation and its security risks
- CORS vs JSONP technical comparison — methods, error handling, credential behavior, migration path
- CORS exploitation payloads — reflected origin with `credentials: include`, null origin via sandboxed iframe
- Dual-site attack lab pattern — localhost:8981 (target) + localhost:8982 (attacker) testing setup