How Broken Object Level Authorization became the #1 API threat
Your API may be handing over private user data to anyone who asks — and you might not even know it.
Broken Object Level Authorization (BOLA) is the #1 threat on the OWASP API Security Top 10 list. It has been used to breach Uber, Facebook, Trello, and hundreds of other companies. Over 57% of organizations have faced some form of this attack.
In simple terms: your API checks if a user is logged in. But it doesn’t check if they’re allowed to see THAT specific record. One changed number in a URL can expose someone else’s data.
This guide breaks down what BOLA is, how it works, real-world breach case studies, and a step-by-step plan to fix it — written for developers, security teams, and business leaders alike
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