API Security Testing
Protect the Backbone of Your Digital Infrastructure
APIs are the backbone of modern applications and the most targeted attack vector for data breaches. Our API security testing service provides thorough assessment of your REST, GraphQL, gRPC, and SOAP APIs. We test authentication, authorization, rate limiting, data exposure, and business logic to ensure your APIs are hardened against real-world attacks. With the explosion of microservices architecture, securing your APIs is no longer optional.
Our Methodology
We follow a rigorous, structured approach to ensure comprehensive coverage and actionable results.
API discovery and documentation review including OpenAPI/Swagger specs and schema analysis
Authentication mechanism testing for API keys, OAuth 2.0, JWT tokens, and session management
Authorization testing with BOLA/IDOR checks across all endpoints and HTTP methods
Input validation testing for injection attacks, mass assignment, and parameter tampering
Rate limiting and resource exhaustion testing to identify denial-of-service vectors
Data exposure analysis to identify over-permissive responses and sensitive data leakage
Real-World Attack Scenarios
These are the types of attacks we simulate to test your defenses against real threat actors.
Broken Object Level Authorization (BOLA)
BOLA is the number one API vulnerability. We systematically test every endpoint for insecure direct object references by manipulating resource identifiers. Common findings include accessing other users' data by changing IDs, bypassing tenant isolation in multi-tenant applications, and escalating from regular user to admin through API parameter manipulation.
Mass Assignment & Property Injection
We test for mass assignment vulnerabilities where attackers can modify object properties they shouldn't have access to. This includes setting admin flags, modifying pricing data, changing account permissions, and bypassing approval workflows by sending additional parameters in API requests that the server blindly accepts.
GraphQL-Specific Attacks
GraphQL introduces unique attack vectors including introspection abuse, query complexity attacks, batch query exploitation, and field-level authorization bypass. We test for excessive data exposure through nested queries, denial of service through deeply nested or circular queries, and authorization flaws in resolver functions.
API Authentication Bypass
We test for JWT algorithm confusion attacks, API key leakage in client-side code, OAuth misconfiguration including redirect URI manipulation, token theft through open redirects, and PKCE downgrade attacks. We also test for broken authentication in API-to-API communication within microservices architectures.
Tools & Technologies
We leverage industry-standard and custom tools to maximize coverage and depth.
What You Get
Complete OWASP API Security Top 10 coverage
Testing of REST, GraphQL, gRPC, and SOAP endpoints
Authentication and authorization testing across all API endpoints
Rate limiting and resource exhaustion validation
Data exposure analysis with sensitive data detection
Machine-readable findings in JSON format for CI/CD integration
API-specific remediation guidance for your backend framework
Regression testing capabilities for continuous API security
Frequently Asked Questions
Can you test APIs that aren't publicly documented?
Yes. We're experienced at API discovery through reverse engineering mobile applications, analyzing JavaScript bundles, brute-forcing common endpoint patterns, and using traffic analysis. We can work with or without documentation, though having OpenAPI/Swagger specs accelerates the engagement.
Do you test GraphQL APIs differently from REST APIs?
Yes. GraphQL has unique security considerations including introspection queries, query depth limits, batch queries, and field-level authorization. We have specific testing methodologies for GraphQL that cover these unique attack vectors in addition to the standard API security checks.
How do you handle API testing in microservices architectures?
We test both the external-facing API gateway and, when in scope, the internal service-to-service communication. This includes testing JWT propagation, service mesh security, internal API authentication, and east-west traffic authorization controls.
Can you integrate with our API development workflow?
Yes. We can provide machine-readable findings that integrate with your CI/CD pipeline, issue trackers like Jira, and security dashboards. We also offer continuous API monitoring and regression testing to catch security issues as your API evolves.
Ready to Secure Your Organization?
Contact us to discuss your security requirements and get a tailored proposal.