Testing API Authentication Weaknesses

When to Use

• Assessing REST API authentication mechanisms for bypass vulnerabilities before production deployment
• Testing JWT token implementation for common weaknesses (none algorithm, key confusion, missing expiration)
• Evaluating whether all API endpoints enforce authentication or if some are unintentionally exposed
• Testing API key generation, storage, and rotation mechanisms for predictability or leakage
• Validating session management including token expiration, revocation, and refresh token security

Do not use without written authorization. Authentication testing involves attempting to bypass security controls.

Prerequisites

• Written authorization specifying target API and authentication mechanisms in scope
• Valid test credentials for at least two user roles (regular user, admin)
• Burp Suite Professional with JWT-related extensions (JSON Web Tokens, JWT Editor)
• Python 3.10+ with requests, PyJWT, and jwt libraries
• Wordlists for credential testing (SecLists authentication wordlists)
• API documentation or OpenAPI specification