The 5 Most Common API Security Mistakes (And How to Fix Them)
Security Mistakes Are Usually Mundane
The breaches that hit APIs are rarely exotic. They come from a handful of ordinary mistakes repeated across teams. The good news is that ordinary mistakes have well-known fixes.
Here are the five that show up most often, and how to close each one.
Mistake One: Broken Object-Level Authorization
The most common API vulnerability is failing to check that a caller may access the specific object they asked for. Authenticating the user but not verifying ownership lets one customer read another's data by changing an id.
Every request for a specific resource must confirm the caller is allowed that exact resource, not just that they're logged in.
Mistake Two: Over-Exposing Data
APIs often return the full database object and rely on the client to show only some fields. Anyone inspecting the response sees everything, including data they should never receive.
Return only the fields a consumer needs. Shape responses on the server; never trust the client to hide sensitive data.
Mistake Three: No Rate Limiting
An API without rate limits invites brute-force, scraping, and denial-of-service. It's also how a single buggy client takes down a service for everyone.
Sensible per-client and per-endpoint limits are basic hygiene, not an advanced feature.
Mistake Four: Weak Authentication
Long-lived tokens, secrets in URLs, and homegrown auth schemes are recurring sources of compromise. Standard, well-tested authentication with short-lived credentials avoids most of it.
Don't invent your own auth. Use proven methods and rotate credentials regularly.
Mistake Five: Flying Blind
You can't respond to an attack you can't see. Without logging and monitoring at the API layer, abuse goes unnoticed until it's a breach.
Aurus enforces authorization, field-level exposure control, rate limiting, and complete access logging at the gateway, closing all five gaps in one place.
