Secure your products with top-tier expert knowledge and advanced Penetration Testing (CREST Approved)

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We transform threats into trust by integrating advanced tech and expertise in product security. Our approach encompasses Security by Design, rigorous security assurance and penetration testing, and compliance through expert documentation, from design to post-market.

We offer CREST-approved pen testing in EMEA, upholding top security standards.
Cyber Legion - CREST Approved

API Penetration Testing

Unlock the full potential of your API with our comprehensive security testing services.

API Penetration Testing (CREST Approved in EMEA)

In the interconnected digital ecosystem, Application Programming Interfaces (APIs) are the conduits that power modern applications. Securing these endpoints is not just a priority; it’s a necessity. API Penetration Testing, a core component of cybersecurity, is the proactive measure that safeguards your API infrastructure. At Cyber Legion, we specialize in CREST-approved assessments of API security, ensuring that your digital assets remain impervious to threats.

APIs facilitate the seamless flow of data and processes, making them essential components of modern applications. Ensuring their security is paramount to safeguard sensitive customer information and system operations. API Penetration Testing identifies and addresses vulnerabilities, reducing the risk of data breaches and other malicious activities.

As APIs become the lifeblood of digital interactions, any lapse in their security can lead to catastrophic consequences. Organizations must implement robust API security measures to mitigate risks. Failure to do so can result in data breaches, reputation damage, and financial losses in the event of a security breach.

Penetration Testing, also known as ethical hacking, is more than a test; it’s a strategic defense mechanism. Our experts simulate cyberattacks, employing a multitude of techniques and technologies to identify and assess vulnerabilities across the API landscape. From servers to API calls and endpoints, we scrutinize every potential point of exposure, ensuring your APIs are fortified against actual attacks.

API security testing and penetration testing are proactive steps to identify and remediate vulnerabilities before they are exploited by malicious actors. This proactive approach mitigates the risk of data loss, reputation damage, and financial setbacks. In an ever-evolving threat landscape, regular API and system testing is imperative to maintain a robust security posture.

Our CREST approval for the EMEA region signifies our unwavering commitment to excellence in API Penetration Testing. We don’t just identify vulnerabilities; we empower you with actionable insights to fortify your API infrastructure. Partner with Cyber Legion to proactively safeguard your digital assets and ensure that your APIs remain the trusted conduits of your business.

Elevate your API security with Cyber Legion’s API Penetration Testing services. Embrace a proactive approach to protect your digital interactions and maintain an unshakable security posture.

Vulnerability Detection

Identify and assess vulnerabilities in API endpoints and data payloads

Threat Simulation

Simulate real-world cyber threats to evaluate API security under various attack scenarios

OWASP Compliance

Ensure adherence to OWASP API security standards to protect against common vulnerabilities

Authentication Testing

Verify the security of authentication mechanisms, preventing unauthorized access

Data Validation

Validate data inputs and outputs to prevent injection attacks and data leakage

Automated Testing

Utilize automated tools for efficient and continuous API security assessment

Customized Test Scenarios

Tailor testing scenarios to focus on specific API vulnerabilities and use cases

Comprehensive Reporting

Receive detailed reports outlining identified vulnerabilities, their severity, and remediation guidance

Integration Support

Seamlessly integrate API security testing into CI/CD pipelines for ongoing protection

API Testing based on OWASP Security Framework Methodology

API testing is a critical process for evaluating the security of an API and protecting against a wide range of attacks. To ensure comprehensive coverage, testers use a combination of manual and automated techniques, including analyzing responses for unexpected behavior and using specialized tools to identify vulnerabilities.

At Cyber Legion, we specialize in API penetration testing and follow industry-standard best practices, including the OWASP Top 10, OWASP ASVS, and OWASP Testing Guide. We take a thorough approach to analyzing the target API and understanding its structure, authentication type, request methods, responses, and roles. Our team has expertise in testing web-based APIs, REST APIs, and mobile APIs.

We understand that conducting security assessments on microservice APIs can be challenging, as traditional web security assessment tools and methodologies may not be equipped to handle the specific characteristics and functionality of these APIs. To address this, we use a defined protocol and tailor our approach to the unique needs of each API.

Our goal is to identify and exploit any bugs or vulnerabilities that may exist, whether on a real production API or in a staging environment. By leveraging our expertise and using a rigorous testing approach, we help organizations minimize the risk of security incidents and safeguard their data and assets.

How can we Help?

At Cyber Legion, we’re here to help you enhance and protect your organization’s security posture. Through our Secure Client Portal, we offer ongoing penetration testing and remediation services that cover application security, mobile app security, API security, IoT, and network penetration testing.

Our testing methodologies are based on reputable security frameworks and designed to minimize disruption during the testing process while keeping you informed every step of the way. We work closely with our clients to achieve the best results for every engagement, providing clear and comprehensive reporting that identifies any issues and helps improve your organization’s security.

Whether you need a one-time test or ongoing testing services, our experienced team is ready to provide the expert support and guidance you need to protect your assets and maintain the highest levels of security. Trust Cyber Legion to help you stay one step ahead of threats and secure your organization’s future.


APIs play a vital role in many important business processes, and it is essential that they are secure and able to withstand attacks. API security testing involves simulating a hacker’s attack on an API to evaluate its security. A security researcher will use various tactics to try to access sensitive user data or disrupt API functionality, and then provide a report to the company outlining any vulnerabilities found and suggesting solutions. Ensuring the security of APIs is critical, especially when they handle personal information.

Achieve all of your security objectives with the help of Cyber Legion’s comprehensive services. Our platform offers both penetration testing and vulnerability management, all in one convenient location. Stay up-to-date on live events and results through our bug tracking, risk dashboards, and ticketing systems. Experience the ultimate in security with Cyber Legion’s integrated solutions.

 API Penetration Testing Service Features


 Unlimited Cyber Legion CSaaS Platform access

 Black, Grey or White Box Testing

 Scheduled Security testing service – Work Request Button whenever you want


 Manual & Automated Security Testing & Risk Validation 


 Business Logic & Technical Vulnerability Testing

 Detailed Exploitation Evidence

 Security Frameworks Checklists OWASP, SANS etc

 OSINT & Threat Intelligence

 Custom Checklists


 Full Support & References for Remediation

 Collaboration & Integration with ticketing, bug trackers etc

 Unlimited Analysis, Tracking & Reporting

 Live Events & Alerting emails 

 Retesting of discovered issues – unlimited

 On-Demand and Custom Offering that Best Suits your Organization’s needs.

The OWASP Security Knowledge Framework is an open source web application that explains secure coding principles in multiple programming languages. The goal of OWASP-SKF is to help you learn and integrate security by design in your software development and build applications that are secure by design.

API’s have increasingly become a target for hackers and malicious users over the years. Improper security can lead to massive data breaches and loss of user data which can go undetected due to the API being abused in a way that seems normal.

API security testing can provide several benefits, including:

  1. Identifying vulnerabilities: API security testing helps identify any vulnerabilities that could potentially compromise the security of your system.

  2. Improving data security: By testing for security vulnerabilities, you can ensure that sensitive data is protected from unauthorized access.

  3. Meeting compliance requirements: Many industries have strict compliance requirements, and API security testing can help ensure that your system meets these requirements.

  4. Protecting against cyber attacks: API security testing can help prevent cyber attacks by identifying and fixing vulnerabilities that could be exploited by hackers.

  5. Enhancing user trust: By ensuring the security of your system, you can build trust with your users and improve customer satisfaction.


Penetration tests (or pen tests) are attacks on your companies’ software and hardware systems, carried out by ‘ethical hackers’ to expose your system’s vulnerabilities. One example is a web application pen test. Web apps, browsers and plug-ins can house sensitive financial or personal data, so hackers are increasingly putting their efforts towards gaining access to them. The test would examine the endpoint of every web application.

The time that penetration testing takes depends on the size and complexity of your organization’s system structure, as well as the scope of the test itself. For the ‘average’ company, a network penetration test should take around three days. For a merchant processing millions of credit cards a year, for example, a pen test will take over a week, or possibly two.

The penetration testing cost depends on the facts identified during scoping, such as the agreed time, goals, technical resources, approach, and remedial support.

Security Testing Pricing list refence 

Test whether an attacker can manipulate object-level authorization controls to access unauthorized resources.

Test whether an attacker can exploit weaknesses in authentication or session management to gain unauthorized access to the API.

Test whether sensitive data is exposed through the API by conducting a comprehensive review of response objects, headers, and error messages.

Test whether the API is vulnerable to injection attacks, such as SQL injection or command injection, by attempting to inject malicious code.

Test whether the API logs all relevant events and errors, and whether the logs are monitored to detect and respond to potential security incidents.

Test whether an attacker can bypass function-level authorization controls to access sensitive API functions.

Test whether the API allows an attacker to modify object properties that should be read-only, or to add additional properties to objects that should not have them.

Test whether the API is configured securely, including checking the use of secure protocols and encryption, and ensuring that sensitive data is protected appropriately.

Test whether the API is vulnerable to man-in-the-middle attacks, eavesdropping, or other forms of interception or manipulation of communication channels.

Test whether the API returns informative error messages that do not disclose sensitive information, and whether it handles errors securely and consistently.

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