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cors-chain-automation

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Use when a bounded list of authorized API endpoints needs consistent CORS triage before browser validation.

redteam/cors-chain-automation/SKILL.md

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Nov 7, 2026
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# Multi-Endpoint CORS Triage

## When to Use

Use when you have a list of API endpoints or target domains and need to systematically find credential-exploitable CORS misconfigurations at scale. Distinguishes the 3 exploitable patterns (reflect-any-origin + credentials, null-origin trust, subdomain-regex bypass) from false positives (ACAO: * alone, ACAC without reflected origin, same-origin-only). Generates ready-to-use browser PoC HTML files for confirmed findings.

## CORS Variations

| # | Variation | Initial signal | Required follow-up |
|---|-----------|----------------|--------------------|
| V1 | Origin reflection with credentials | Reflected origin and `ACAC: true` | Credentialed browser reads protected data |
| V2 | Null-origin trust | `ACAO: null` and `ACAC: true` | Sandboxed browser proof |
| V3 | Wildcard without credentials | `ACAO: *` | Determine whether the data is already public |
| V4 | Credentialed preflight | OPTIONS accepts origin and method | Actual browser request succeeds |
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