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API Security Assessment Checklist

A practical cybersecurity checklist designed to help organizations assess risks, improve compliance, and strengthen security controls.

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What's Inside?

Application Programming Interfaces (APIs) are the backbone of modern web applications and microservices, making them a primary target for attackers. This checklist outlines the core security practices required to protect APIs from common vulnerabilities, authentication bypasses, and data exposure.

Core API Security Focus Areas:

Key Focus Areas

Implement robust authentication using OAuth2.0 or OpenID Connect with JWT validation.

Enforce strict authorization controls, verifying scopes and user permissions at every endpoint.

Apply Rate Limiting and Throttling to prevent denial of service (DoS) and brute force attacks.

Validate and sanitize all incoming input data to prevent injection attacks and format issues.

Implement CORS policy restrictions to prevent unauthorized domains from invoking your API.

Enforce Transport Layer Security (TLS 1.3 preferred) for all API communications.

Prevent sensitive data exposure by filtering API responses and avoiding verbose error messages.

Secure API gateways with proper request logging, web application firewall (WAF) integration, and monitoring.

Regularly scan API definitions (OpenAPI/Swagger) for structural and logic flaws.

Rotate API keys and secrets periodically using secure key management stores.

Implement strict object-level and function-level authorization checks (BOLA/BFLA prevention).

Enable real-time logging, security monitoring, and anomaly detection on API requests.

Designed for Security Engineers, API Developers, and DevSecOps leads looking to harden their REST/GraphQL/gRPC APIs.

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