cors-csrf-defense

Cross-Origin Resource Sharing (CORS) whitelisting, preflight caching, and anti-CSRF token verification.

SKILL.md

GitHub

CORS & CSRF Defense Protocol

  1. Never use Access-Control-Allow-Origin: * with credentials.
  2. Whitelist explicit origin domains dynamically.
  3. Require custom headers (e.g. X-Requested-With) on state-changing API mutations.