What is API Penetration Testing?
Web Services or API Penetration Testing assesses the security of the interfaces and integrations that connect your systems, mobile apps, and third-party platforms. These tests simulate real-world attacks against REST, SOAP, and GraphQL APIs to identify authentication flaws, data exposure, and insecure configurations.
For executives, API testing provides vital assurance that the organisation’s digital supply chain is secure. It validates the controls protecting sensitive transactions, customer data, and business logic — helping to prevent breaches, service disruption, and regulatory non-compliance.
Why Your Business Needs API Penetration Testing
As digital ecosystems expand, APIs have become the connective tissue of financial and fintech operations — handling everything from payments to identity verification. Yet, poorly secured APIs are one of the most exploited entry points in modern breaches.
Regular API testing allows your business to stay ahead of emerging threats by uncovering vulnerabilities in authentication, authorisation, and data handling. It also ensures compliance with frameworks such as PCI DSS, ISO 27001, and the Digital Operational Resilience Act (DORA), which increasingly expect robust API security controls.
Benefits of API Penetration Testing
- Identify authentication, authorisation, and input validation flaws
- Prevent unauthorised access to customer or transactional data
- Demonstrate compliance with PCI DSS, ISO 27001, and DORA requirements
- Validate secure integration between internal and third-party systems
- Strengthen overall resilience of your digital products and services
- Reduce regulatory, reputational, and financial risk
How Rexon Cyber Delivers
Rexon Cyber’s consultants use advanced manual and automated methodologies aligned with the OWASP API Security Top 10. We assess authentication, authorisation, encryption, error handling, and business logic to uncover both technical and process-level weaknesses.
Our deliverables include a comprehensive technical report, an executive summary written in plain business language, and a prioritised remediation roadmap. Every engagement concludes with a debrief session to ensure your teams fully understand the findings and next steps.
FAQ's
Recommended Next Steps
Pair your API Penetration Test with Web Application Testing and a Cloud Security Audit to ensure comprehensive coverage of your application and data environment.