Access token stolen. What's next: three layers of protection in your OpenID provider

This Habr article addresses the vulnerability of bearer tokens, which allow attackers to impersonate legitimate users if stolen. The author analyzes the risks inherent in the fact that servers often cannot distinguish between the token owner and an attacker until the key expires. To mitigate this, the article proposes implementing three layers of protection within a custom OpenID provider, redb.Identity. Key methods include using a Backend For Frontend (BFF) architecture to prevent token storage in the browser, binding tokens to keys using the DPoP protocol to prove possession, and implementing rapid revocation mechanisms. These measures significantly enhance authentication security by minimizing the window of opportunity for attackers and providing more robust control over user sessions in modern web applications.