Securing RESTful APIs against BOLA

Broken Object Level Authorization (BOLA) is the most critical vulnerability in modern APIs. Attackers manipulate resource IDs in API requests to access sensitive data belonging to other users.

How to Prevent BOLA

1. Implement robust authorization checks: Always validate resource ownership at the controller level.
2. Avoid sequential integer IDs: Use randomized UUIDs to prevent automated resource enumeration.
3. Contextual tokens: Verify that the requesting user's identity token matches the resource context.