OWASP API Security Top 10 2021/2023/2025 with Java Examples – (Free Course)

Have you ever wondered how secure your APIs really are? In a world where data breaches, leaks, and unauthorized access are rising rapidly, understanding API Security has become an essential skill for every developer. If you work with backend systems, microservices, or mobile app APIs, mastering OWASP API Security Top 10 can help you write safer and more reliable applications — and now, you can learn it for free.

This new Free OWASP API Security Course (2025 Edition) helps learners explore the OWASP API Security Top 10 vulnerabilities (2021–2025) using Java examples and real-world attack scenarios. Whether you’re a beginner or a professional developer, this course is designed to boost your security awareness and coding confidence.

What is OWASP API Security?

OWASP (Open Web Application Security Project) is a non-profit foundation that improves the security of software globally. The OWASP API Security Top 10 is a list of the ten most critical API security risks identified by security experts. These guidelines are followed by developers and organizations worldwide to protect APIs from potential threats and breaches.

APIs are the backbone of modern applications — from mobile apps to cloud services. However, poorly secured APIs can expose sensitive data. That’s why understanding OWASP API Security 2021, 2023, and 2025 updates is crucial for developers, testers, and architects.

Why You Should Enroll in This OWASP API Security Free Course

This Free OWASP API Security Course is designed to help developers learn about the latest vulnerabilities, secure coding practices, and defensive strategies. Here’s why it’s a must-join:

• 100% Free Course with Certificate
• Covers OWASP API Security Top 10 (2021–2025)
• Includes Real Java Examples and Case Studies
• Beginner-Friendly Yet Industry-Applicable
• Learn API Threat Modeling, Testing, and Hardening
• Certificate Recognized by Cybersecurity Professionals

Course Overview – OWASP API Security Top 10 (2021/2023/2025)

Course Title	OWASP API Security Top 10 2021/2023/2025 with Java Examples – Free Course
Course Provider	OWASP Learning Community / Partner Platforms
Mode of Study	Online (Self-Paced)
Level	Beginner to Intermediate
Duration	20–25 hours
Language	English
Course Fee	100% Free
Certificate	Yes, after course completion
Primary Focus	API Security using OWASP Top 10 & Java
Official Website	OWASP.org
Apply Now	Enroll Here

OWASP API Security Top 10 – Explained with Java Examples (2021/2023/2025)

Let’s break down the OWASP API Security Top 10 vulnerabilities that every developer should know.

1. Broken Object Level Authorization (BOLA)

• Issue: Exposes endpoints that handle object IDs without proper authorization checks.
• Java Example:

// Insecure example
@GetMapping("/user/{id}")
public User getUser(@PathVariable int id) {
    return userRepository.findById(id);
}

Fix: Always validate user permissions before returning data.

2. Broken User Authentication

• Weak authentication can let attackers compromise accounts.
• Use JWT tokens, secure session management, and Spring Security best practices.

3. Excessive Data Exposure

• APIs often return more data than necessary.
• Filter sensitive fields before sending a response.

4. Lack of Resource & Rate Limiting

• Without limits, APIs are vulnerable to denial-of-service (DoS) attacks.
• Use Spring Boot Rate Limiter or middleware to control request frequency.

5. Broken Function Level Authorization

• Attackers might access admin endpoints by manipulating URLs.
• Always verify roles and privileges using proper Java authorization annotations.

6. Mass Assignment

• Happens when developers bind user input directly to model objects.
• Use DTOs and explicit field mapping to prevent this.

7. Security Misconfiguration

• Default credentials, open ports, or exposed stack traces can compromise security.
• Regularly scan APIs using OWASP ZAP.

8. Injection

• SQL and Command Injections remain major threats.
• Use Prepared Statements or ORM frameworks like Hibernate.

9. Improper Assets Management

• Outdated API versions or documentation leaks can expose endpoints.
• Always deprecate and secure old API versions.

10. Insufficient Logging & Monitoring

• Without proper logs, it’s hard to detect intrusions.
• Use Spring Boot Actuator and monitoring tools to track suspicious activities.

What’s New in OWASP API Security 2023 and 2025 Updates?

The 2023–2025 updates focus on modern API threats including:

• API supply chain vulnerabilities
• GraphQL and REST hybrid security
• Misuse of JWT tokens and OAuth2 misconfiguration
• AI-powered API attacks and automated exploitations

These revisions ensure developers stay ahead of the evolving security landscape.

Who Can Enroll in This OWASP API Security Free Course?

This free course is suitable for anyone interested in cybersecurity or API development, including:

• Software Developers (Java, Python, Node.js)
• Cybersecurity Enthusiasts
• QA Engineers & Testers
• Backend Engineers
• Students & IT Graduates

No prior experience in cybersecurity is required — basic programming knowledge is enough to start.

Skills You’ll Gain After Completing the Course

• OWASP API Security Top 10 fundamentals
• Secure API design using Java
• Authentication and authorization techniques
• Rate limiting, logging, and monitoring
• Vulnerability testing using OWASP ZAP and Postman
• Real-world understanding of 2025 API threats

How to Enroll in the OWASP API Security Free Course 2025

Follow these quick steps to start learning today:

1. Visit the OWASP.org official learning portal.
2. Sign up for a free account or use your existing login.
3. Search for “OWASP API Security Top 10 2025”.
4. Click on Enroll Now and start the course instantly.
5. Complete all modules, take assessments, and download your free certificate.

You can also Apply Now directly through the official page.

Why OWASP API Security Knowledge is Essential in 2025

In 2025, as APIs dominate digital ecosystems, security has become the top priority for enterprises. Understanding OWASP API Security not only protects applications but also enhances your profile as a developer.

Employers actively look for professionals who understand how to prevent attacks like BOLA, SQL injection, and misconfigurations — making this certification an asset for any IT or software job.

With this free OWASP API Security course, you can:

• Learn from industry experts.
• Apply Java-based security in real scenarios.
• Build safer APIs for your projects.
• Gain recognition with a globally respected certification.

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FAQs – OWASP API Security Course 2025

Q1. Is the OWASP API Security Course really free?
Yes, it’s completely free and offered through official OWASP and partner learning platforms.

Q2. Do I get a certificate after completion?
Yes, you’ll receive an official OWASP API Security Certificate after finishing all modules.

Q3. Can I learn this course if I’m a beginner?
Absolutely! The course starts from basics and moves to advanced topics gradually.

Q4. Is Java necessary for this course?
No, but the course includes Java examples for practical understanding. Developers from other languages can still benefit.

Q5. What is the duration of this course?
It takes around 20–25 hours to complete at your own pace.

Final Thoughts

The OWASP API Security Top 10 2021/2023/2025 Free Course is an invaluable resource for anyone serious about securing APIs and mastering backend development. It not only teaches real-world security principles but also gives you hands-on experience with Java examples and best practices trusted by professionals globally.

Start your learning journey today and make your APIs secure, resilient, and future-ready.

Apply now for the OWASP API Security Free Course 2025 and become a confident, security-aware developer.

Closing Note
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