API Security
API Security 101: BOLA, Injection, and Auth-Bypass Risks
How to prevent Broken Object Level Authorization and data leaks in microservices.
LOZULA Application Security Team
2026-05-14
7 min read
Key Takeaways for Security Teams
- Enforce tenant ownership checks on every internal database lookup.
BOLA remains the #1 vulnerability in modern APIs, allowing attackers to access arbitrary records by altering numeric or UUID keys.
Enforcing Object-Level Permissions
Always validate that the authenticated user owns the requested resource ID at the database query layer, not just at the route gateway.