testing-oauth2-implementation-flaws
Testing OAuth2 Implementation Flaws
When to Use
- Assessing OAuth 2.0 authorization code flow for redirect URI validation weaknesses
- Testing OAuth client applications for CSRF protection (state parameter usage) and PKCE enforcement
- Evaluating token storage, transmission, and lifecycle management in OAuth implementations
- Testing scope escalation where clients request more permissions than authorized
- Assessing OpenID Connect implementations for ID token validation and nonce usage
Do not use without written authorization. OAuth testing may result in token theft or unauthorized access.
Prerequisites
- Written authorization specifying the OAuth provider and client applications in scope
- Test OAuth client registered with the authorization server
- Burp Suite Professional for intercepting OAuth redirects and token flows
- Python 3.10+ with
requestsandoauthliblibraries - Browser developer tools for observing OAuth redirect chains
- Knowledge of the OAuth 2.0 grant types in use (authorization code, implicit, client credentials)
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