API penetration testing.
We test backend REST, GraphQL, gRPC, and WebSocket APIs for broken object-level authorization, mass assignment, token validation weaknesses, and business logic abuse.
What is in scope
Key technical areas and vulnerability classes evaluated during the assessment.
Broken Object Level Authorization (BOLA)
Testing whether authenticated callers can read, modify, or delete resources belonging to other users or tenants by manipulating object identifiers.
Broken Object Property Level Authorization
Testing REST payloads and GraphQL mutations for mass assignment and excessive data exposure in API responses.
API authentication and JWT security
Testing API keys, OAuth bearer tokens, JWT signature verification, algorithm confusion, key injection, and refresh token rotation.
GraphQL, gRPC, and WebSocket testing
Testing GraphQL introspection, query batching, recursive depth limits, gRPC protobuf message fuzzing, and WebSocket origin and authorization checks.
Rate limiting and resource consumption
Evaluating protection against automated credential stuffing, OTP brute-forcing, pagination scraping, and expensive query denial of service.
Server-side request forgery and webhooks
Testing webhook callbacks, URL fetchers, and third-party microservice integrations for internal network pivoting and metadata service access.
Testing methodology
Our step-by-step engineering workflow from reconnaissance to verified proof of concept.
1. Schema ingestion and endpoint discovery
We ingest OpenAPI/Swagger specs, Postman collections, GraphQL schemas, or Protobuf definitions and scan for undocumented shadow endpoints.
2. Multi-role authorization matrix testing
We replay every API call across unauthenticated, standard user, manager, and administrator tokens to verify strict access enforcement.
3. Parameter fuzzing and state manipulation
We test unexpected data types, negative numbers, array injections, and concurrent requests against state-changing API endpoints.
4. Patch verification and sign-off
We retest patched endpoints to verify that authorization checks and schema validations are enforced consistently.
Deliverables and retesting
What your engineering and compliance teams receive at the conclusion of testing.
Endpoint-level vulnerability report
Documents each vulnerable route, HTTP method, payload, and server response so backend engineers can reproduce issues immediately.
Schema and gateway hardening guide
Actionable recommendations for API gateway policies, rate limiting, JWT validation, and DTO serialization.
Retest verification certificate
Formal confirmation that identified API vulnerabilities have been remediated and verified.
Scope your assessment
Contact our security team with your target details to receive a clear scoping plan.