Introduction

APIs (Application Programming Interfaces) have become the backbone of modern software architecture. They allow applications to communicate with each other, power mobile applications, and orchestrate microservices. However, this ubiquity makes APIs a prime target for attackers.

Among the most critical and widespread vulnerabilities are Broken Access Control issues, ranked #1 in the OWASP Top 10 2021 and #1 in the OWASP API Security Top 10 2023.

This article explores these vulnerabilities through a practical case, then presents best practices for securing your APIs.