API Security Testing

Protect Your Data Exchange Layer

APIs (Application Programming Interfaces) are the backbone of modern digital services, enabling communication between applications, devices, and servers. As businesses become increasingly interconnected, APIs have also become prime targets for cybercriminals. At GS2 Cyber Security, our API Security Testing services ensure your APIs are robust, secure, and compliant.

Why API Security Matters

APIs often handle sensitive data—user credentials, personal information, financial records, and more. A single insecure API endpoint can expose your entire application to unauthorized access, data breaches, or service disruption. Our testing uncovers flaws before attackers can exploit them.

What We Test For

Our comprehensive API security testing covers:

  • Authentication & Authorization Flaws
    Ensuring only the right users and systems can access your APIs using methods like OAuth, JWT, and API keys.

  • Insecure Data Transmission
    Checking for unencrypted communication and data exposure over HTTP instead of HTTPS.

  • Rate Limiting & Throttling
    Preventing abuse or DDoS-style attacks by enforcing usage limits.

  • Injection Vulnerabilities
    Identifying risks such as SQL/Command injections that allow attackers to manipulate backend systems.

  • Improper Error Handling
    Detecting overly verbose error messages that could leak server-side logic or paths.

  • Business Logic Issues
    Testing for flaws in API behavior that could allow users to bypass rules or manipulate workflows.

Our Approach

We use a mix of automated tools and manual testing to simulate real-world attack scenarios on your APIs. Our team evaluates both public and internal APIs (REST, SOAP, GraphQL) to ensure full coverage. After assessment, you receive a detailed report with:

  • Risk ratings

  • Proof-of-concept exploits

  • Clear remediation guidance

  • Retesting support post-fix

Benefits of API Security Testing

✔ Protects sensitive data across systems
✔ Prevents unauthorized access and data leakage
✔ Ensures regulatory compliance (GDPR, HIPAA, PCI-DSS)
✔ Builds trust with clients and partners
✔ Secures mobile and web apps relying on APIs

Stay Ahead of API Threats

Stay Ahead of API Threats

With APIs becoming the digital gateway to your services, don’t leave them vulnerable. Choose GS2 Cyber Security’s API Security Testing to ensure your integrations are safe, reliable, and secure.