API Security Testing
Secure the interfaces that power your applications.
Comprehensive security assessment of REST, GraphQL, and SOAP APIs covering authentication, authorization, injection vulnerabilities, and business logic flaws.
Overview
APIs are the backbone of modern applications—and increasingly the target of sophisticated attacks. Our API security testing goes beyond automated scanning to examine authentication mechanisms, authorization logic, rate limiting, and business logic vulnerabilities that could expose data or enable fraud.
What We Test
Our api security testing engagements cover these key areas:
Authentication
OAuth flows, JWT implementation, API keys, and session management tested for bypass and token manipulation vulnerabilities.
Authorization
Object-level and function-level access controls evaluated to prevent unauthorized data access and privilege escalation.
Injection Vulnerabilities
SQL, NoSQL, command injection, and GraphQL-specific attacks tested across all API endpoints.
Rate Limiting & DoS
Rate limiting implementation, resource exhaustion, and batch operation abuse tested to identify availability risks.
Data Exposure
Response filtering, error handling, and verbose messages analyzed for sensitive data leakage.
Business Logic
API workflows examined for logical flaws that could enable fraud, process bypass, or unintended actions.
Our Approach
Our API testing methodology addresses the OWASP API Security Top 10 while incorporating deep analysis of your specific business logic and data flows.
API Discovery
We enumerate all endpoints, parameters, and authentication requirements. Hidden or undocumented endpoints are identified.
Authentication Analysis
Authentication mechanisms are analyzed for weaknesses in token generation, validation, and session management.
Authorization Testing
We systematically test access controls by attempting to access resources across user roles and object boundaries.
Injection Testing
All input parameters are tested for injection vulnerabilities using both automated tools and manual techniques.
Business Logic Testing
We analyze API workflows for logical flaws, focusing on state manipulation, race conditions, and process bypass.
Common Findings
These are issues we frequently discover during api security testing engagements:
Broken Object Level Authorization
CriticalAPIs returning data for objects the user shouldn't access by manipulating object IDs in requests.
Broken Function Level Authorization
CriticalAdministrative endpoints accessible to regular users or unauthenticated callers.
Excessive Data Exposure
HighAPIs returning more data than needed, relying on client-side filtering to hide sensitive fields.
Mass Assignment
HighAPIs accepting and processing object properties that shouldn't be user-modifiable (roles, permissions, balances).
Insufficient Rate Limiting
MediumMissing or bypassable rate limits enabling brute force, enumeration, or resource exhaustion attacks.
Security Misconfiguration
MediumVerbose error messages, CORS misconfiguration, or missing security headers exposing attack surface.
Common Questions
Do you test REST, GraphQL, or both?
We test all API types: REST, GraphQL, SOAP, and gRPC. Each technology has specific vulnerabilities—GraphQL has introspection and query complexity issues; REST has object-level authorization challenges. We tailor our approach to your technology stack.
Do you need API documentation?
Documentation helps us test efficiently, but isn't required. We can enumerate endpoints through traffic analysis, application reverse engineering, or OpenAPI/GraphQL schema discovery. If documentation exists, it also helps us identify undocumented endpoints.
How do you handle authentication?
We need valid credentials for authenticated testing. Typically, we request test accounts for each user role. For OAuth flows, we may need client credentials or help setting up appropriate test configurations.
Other Application Testing Options
Web Application Testing
Following OWASP methodologies, we probe your web applications for injection flaws, authentication bypasses, business logic vulnerabilities, and data exposure risks.
Mobile Application Testing
Security assessment of iOS and Android applications covering client-side vulnerabilities, backend API security, data storage, and platform-specific attack vectors.
Ready to Strengthen Your Defenses?
Schedule a free consultation with our security experts to discuss your organization's needs.
Or call us directly at (445) 273-2873