API Security Testing

APIs are now the dominant attack surface for modern applications and the area most penetration tests cover poorly. The OWASP API Security Top 10 is dominated by authorization, authentication, and business logic flaws — the kinds of bugs that automated scanners cannot find. Mjolnir delivers deep, manual API security testing that finds the issues that matter.

OWASP API Top 10 Testing

Comprehensive coverage of the API-specific vulnerability classes that scanners miss.

• Broken object-level authorization (BOLA) testing across all endpoints and parameters
• Broken authentication, JWT validation, and session management flaws
• Excessive data exposure and mass assignment vulnerabilities
• Lack of resources and rate limiting (DoS, scraping, enumeration)
• Function-level authorization testing including admin endpoint discovery

Business Logic & Workflow Testing

Real attackers exploit business logic flaws because automated tools cannot. We test the workflows that matter to your business.

• Race condition and concurrency flaws in financial and inventory operations
• Workflow bypass and state manipulation testing
• Cryptocurrency and payment flow abuse scenarios
• Multi-tenancy isolation testing for SaaS platforms

REST, GraphQL, and gRPC

We test all the API styles your applications actually use, with techniques specific to each.

• REST API testing including OpenAPI/Swagger documentation review
• GraphQL introspection, query depth, batching attacks, and field-level authorization
• gRPC reflection, server streaming abuse, and protobuf manipulation
• WebSocket and Server-Sent Events authentication and authorization testing