Oauth 2.0 Common Security...

OAuth 2.0 powers billions of secure API requests daily, but implementation mistakes create dangerous security gaps. In July 2025, attackers exploited malicious OAuth applications to breach Allianz Life's Salesforce systems, exposing 1.1 million customer records. Authentication and authorization failures remain primary attack vectors across industries. Understanding OAuth security flaws helps security teams protect APIs before attackers exploit vulnerabilities. … ### Misusing OAuth for Authentication OAuth 2.0 handles authorization, not authentication. Building custom authentication on OAuth alone creates business logic vulnerabilities. **Prevention:** - Use OpenID Connect for authentication - Use OAuth for authorization only - Implement ID tokens for identity verification … ## FAQs **What is the most common OAuth security vulnerability?** Redirect URI manipulation remains the most common flaw. OAuth 2.1 requires exact string matching to prevent interception. **How does PKCE prevent OAuth attacks?**