API Penetration Testing & Microservices
Modern applications rely on APIs as their true attack surface. We audit your backend REST endpoints, GraphQL schemas, and internal service-to-service RPC protocols for Broken Object Level Authorization (BOLA), mass assignment, and hidden data leaks.
Key Vulnerabilities We Hunt In Your APIs
APIs expose direct database models and business logic without UI safety nets. We dissect every route.
BOLA & Object Property Leaks
Accessing other users' resources via manipulated UUIDs, IDOR across tenant boundaries, and excess data exposure in serialized response objects.
Mass Assignment & Parameter Tampering
Over-posting malicious attributes (such as `is_admin: true` or `role_id: 1`) directly modifying sensitive entity models without strict DTO validation.
GraphQL Introspection & Abuse
Circular queries, deep nested query resource exhaustion, schema leakages, and batch query exploitation to bypass brute-force limits.
Rate Limit Evasion & DoS
Header spoofing (`X-Forwarded-For`), HTTP verb swapping, and computationally heavy payload injections that tie up microservice thread pools.
Broken JWT & API Key Handling
Algorithm confusion (`none` / HS256 to RS256), missing signature checks, expired token reuse, and improper scoping of service-to-service machine tokens.
SSRF & Webhook Deserialization
Exploiting outbound webhook processors and callback endpoints to scan internal VPC subnets and metadata APIs.
Direct curl Commands & Postman Reproduction Collections
No vague vulnerability write-ups. Your engineers get ready-to-run curl commands and Postman collections reproducing each finding instantly in staging.
Importable JSON collections demonstrating the exact bypass flow with environmental variables.
Concrete architectural code recommendations for Node.js, Go, Python, Java, and PHP backends.
Formal verification document confirming zero high/critical vulnerabilities for enterprise procurement.
Frequently Asked Questions
Do we need to provide OpenAPI / Swagger specs? ↓
While not strictly required (we can reverse-engineer APIs from client apps or proxy traffic), providing Swagger/OpenAPI or Postman collections significantly accelerates testing depth and ensures maximum endpoint coverage.
Can you test authenticated GraphQL endpoints with rate limiting? ↓
Yes. We analyze schema introspection, test query depth limits, and test batching operations (`query { a: getUser(id:1), b: getUser(id:2) }`) to determine if rate limits can be bypassed.
What is your policy for testing in production vs staging? ↓
We recommend staging environments for high-throughput and state-modifying requests (like bulk deletes or fuzzing), and staging or carefully throttled production for read-oriented authorization checks.
Protect Your Microservices & APIs
Connect with our API security specialists today to schedule your assessment scoping under mutual NDA.