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Application Security Standards

Free guide · OWASP API Security Top 10 (2023)

How every OWASP API risk gets exploited, and how to stop it.

A free 17-page guide to the OWASP API Security Top 10 (2023). For each risk: what it is, how attackers exploit it, and the controls that prevent it. Here is a real example, straight from the guide.

From the guideAPI1 · Broken Object Level Authorization

An attacker changes one number and reads another customer's account.

The API authenticates the user but never verifies they own the record, so a properly logged-in user can change the ID and reach data that is not theirs.

Example, from the guide

GET /api/accounts/12345 # the user's own accountGET /api/accounts/12346 # another customer's data

Prevention best practices, from the guide

  • Validate object ownership on every request
  • Implement centralized authorization controls
  • Enforce least-privilege access
  • Use indirect object references where possible

That is 1 of 10. The full guide covers all ten the same way: what it is, how it is exploited, the impact, and how to prevent it, plus a 15-point checklist. Free.

OWASP API Security Top 10

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A free 17-page guide to the OWASP API Security Top 10 (2023). For each risk: what it is, how attackers exploit it, and the controls that prevent it. Here is a real example, straight from the guide.

That is 1 of 10. The full guide covers all ten the same way: what it is, how it is exploited, the impact, and how to prevent it, plus a 15-point checklist. Free.

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Written for API developers, AppSec engineers, and security leads.

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What's inside

All ten, in the same practical format.

Every risk gets the same treatment: what it is, how attackers exploit it, its impact, and the controls that prevent it.

API1Broken Object Level Authorization
API2Broken Authentication
API3Broken Object Property Level Authorization
API4Unrestricted Resource Consumption
API5Broken Function Level Authorization
API6Unrestricted Access to Sensitive Business Flows
API7Server-Side Request Forgery
API8Security Misconfiguration
API9Improper Inventory Management
API10Unsafe Consumption of APIs

Plus a 15-point API security checklist and the seven key questions every security team should ask.

Before you ask

Straight answers.

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Ten risks, explained and prevented.

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