API Security Testing
Your APIs are doors. We test the locks.
Secure your API attack surface.
Testing Options
Modern applications rely on APIs, making them a prime target for attackers. Our API security testing identifies vulnerabilities in authentication, authorization, data validation, and business logic to protect your most critical integration points.
REST API Testing
Comprehensive testing of RESTful APIs for authentication bypass, injection flaws, broken object-level authorization, and data exposure.
GraphQL Security
Specialized testing for GraphQL APIs including introspection attacks, query complexity abuse, and authorization bypass.
SOAP/XML Services
Legacy web service testing for XML injection, SOAP action spoofing, and WS-Security implementation flaws.
OAuth/OIDC Assessment
Authentication flow testing for OAuth 2.0 and OpenID Connect implementations, including token handling and redirect vulnerabilities.
Mobile Backend APIs
Testing APIs that support mobile applications, focusing on certificate pinning bypass, API key exposure, and mobile-specific attack vectors.
How We Work
APIs require a different testing approach than web applications. We combine automated scanning with manual testing focused on business logic, authentication flows, and data exposure—the vulnerabilities scanners miss.
API Discovery & Documentation
We map your API surface through documentation review, traffic analysis, and automated discovery to ensure complete coverage.
Authentication & Authorization Testing
We test every authentication mechanism and authorization control, looking for bypass opportunities and privilege escalation paths.
Input Validation Testing
We probe all API inputs for injection vulnerabilities, including SQL, NoSQL, command, and server-side template injection.
Business Logic Testing
We analyze API workflows for logic flaws that could allow rate limit bypass, resource manipulation, or transaction abuse.
Data Exposure Analysis
We examine API responses for excessive data exposure, sensitive information leakage, and improper error handling.
What You Get
Our API security reports are designed for both developers and security teams—technical enough to drive fixes, clear enough for prioritization.
Executive Summary
High-level overview of API security posture, critical findings, and business risk assessment.
Technical Findings Report
Detailed vulnerability documentation with proof-of-concept examples, affected endpoints, and reproduction steps.
OWASP API Top 10 Mapping
Findings mapped to the OWASP API Security Top 10 for standardized risk classification.
Developer Remediation Guide
Code-level recommendations and secure implementation patterns for each finding.
API Security Checklist
Comprehensive checklist for ongoing API security validation during development.
Postman/OpenAPI Collection
Test collection documenting all tested endpoints and vulnerability payloads for regression testing.
Why Breach Craft for API Security
Developer Background
Our testers have built APIs. We understand REST design, GraphQL resolvers, and authentication flows from the inside out.
Beyond OWASP Top 10
We test for the OWASP API Top 10, but we don't stop there. Business logic flaws and chained vulnerabilities often present the highest risk.
Modern API Coverage
REST, GraphQL, gRPC, WebSockets—we test the API technologies you're actually using, not just legacy SOAP services.
Actionable for Developers
Our reports include code examples and secure implementation patterns. Developers can fix issues without guessing.
CI/CD Integration Guidance
We provide recommendations for integrating API security testing into your development pipeline for continuous validation.
Common Questions
Do you need API documentation?
It helps but isn't required. We can work from OpenAPI/Swagger specs, Postman collections, or discover endpoints through traffic analysis and reverse engineering. Complete documentation means faster testing; missing documentation means we'll find what you forgot about.
Can you test APIs behind authentication?
Yes. We typically need test credentials or API keys to test authenticated functionality. For OAuth flows, we'll need appropriate scopes. We can also test your authentication mechanisms themselves if that's in scope.
What about rate limiting and WAF rules?
We recommend allowlisting our testing IPs to avoid false positives and ensure complete coverage. However, we can also test with rate limiting active to validate those controls are working effectively.
How is this different from web application testing?
Web application testing focuses on browser-based attacks like XSS and CSRF. API testing focuses on direct API calls—authentication bypass, broken object-level authorization, mass assignment, and data exposure that doesn't involve a browser.
Can you test internal APIs?
Yes. Internal APIs often receive less security attention but can be reached through SSRF or compromised internal systems. We can test from inside your network via VPN or test from externally-reachable internal endpoints.
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