OAuth and OpenID Connect Security

OAuth misconfigurations lead to account takeovers.

Common Vulnerabilities

- Open redirect attacks
- CSRF in OAuth flow
- Token leakage
- Insufficient scope validation
- Insecure state parameter

Best Practices

- Validate redirect URIs strictly
- Use PKCE for public clients
- Short-lived access tokens
- Secure token storage
- Implement token binding

Security Headers

- Use state parameter
- Implement nonce
- Validate ID tokens
- Check token audience