Service

API Security Testing

Security testing for REST and GraphQL APIs — authentication, authorization, object-level access, input validation, rate limits and business logic across every endpoint your business exposes.

Assess My APIs All services
The problem

Why this assessment matters

APIs carry the data and transactions behind web, mobile and partner integrations. Because they are built for machines, small mistakes — a missing object-level check, an over-permissive endpoint, a verbose response — are easy to expose at scale and hard to notice in a UI. One weak endpoint can leak records across every tenant you serve.

Scope

What We Test

Typical coverage for this assessment, tailored to your system during scoping.

  • API discovery
  • Authentication
  • Authorization
  • BOLA / IDOR
  • Input validation
  • Rate limiting
  • Business logic
  • Sensitive data exposure
  • REST
  • GraphQL
Methodology

How the Assessment Runs

A consistent six-stage process — every stage produces something you can use.

  1. Discover

    Inventory endpoints from specifications, traffic, mobile/web clients and JavaScript bundles. Reconstruct undocumented and legacy routes.

  2. Assess

    Test authentication, object- and function-level authorization, parameter handling, rate limits and workflow logic per endpoint.

  3. Validate

    Prove each candidate with controlled cross-account requests and captured request/response evidence.

  4. Report

    Deliver endpoint-level findings with evidence, impact and concrete remediation — mapped to OWASP API Security risks.

  5. Remediate

    Support your engineers with guidance on centralized authorization, validation and schema enforcement.

  6. Retest

    Confirm fixes and check that new endpoints introduced during remediation follow the corrected patterns.

Example outcomes

Typical Findings

Realistic issue classes commonly discovered during this type of assessment. Your results depend on your system — we do not imply guaranteed findings.

  • BOLA — accessing other users’ objects by changing an identifier
  • Broken function-level authorization on admin or internal endpoints
  • Excessive data exposure in list and detail responses
  • Mass assignment via undocumented fields
  • GraphQL introspection, batching abuse or missing field-level authz
  • Missing or weak rate limiting on sensitive operations
  • Inconsistent authentication across endpoint versions
  • Verbose errors leaking stack traces or internal paths
What you receive

Deliverables

Everything needed to understand, prioritize and fix what we find.

  1. Complete endpoint inventory with tested coverage
  2. Findings with reproduction requests and responses
  3. Risk prioritization by data sensitivity and exploitability
  4. Remediation guidance for authorization and validation layers
  5. Retest report verifying fixes
Attack surface

Where API Security Fits in Your Attack Surface

The shared, data-driven attack-surface map — API Security is emphasised automatically. Select any node to see its assessment path, related systems and security objective.

Interactive 3D map of the security attack surface — Web, API, Mobile, Thick Client, Cloud, Internal, External, AI and Blockchain. Select a node to explore a service.

Interactive 3D map of the security attack surface. Select a node to see the service description, assessment path and related systems. A static list of all services is provided below.
  1. Discover
  2. Map
  3. Assess
  4. Validate
  5. Correlate
  6. Risk
  7. Evidence
  8. Remediate
  9. Retest
  • Assessment / attack path
  • Application / API
  • Identity / security core
  • Defensive
  • Critical risk
Fit

Who Needs This

Companies exposing REST or GraphQL APIs to web, mobile or partners

Teams adding versioned APIs or opening partner integrations

Organizations moving business workflows behind API gateways

Any product where the API is the primary attack surface

Questions

Frequently Asked Questions

What do you need for an API assessment?

An endpoint inventory or specification (OpenAPI/GraphQL schema if available), test credentials for each role, and ideally access to traffic samples or client applications. Where documentation is incomplete we help reconstruct the surface.

Do you test GraphQL as well as REST?

Yes. GraphQL testing covers introspection exposure, schema-driven enumeration, resolver-level authorization, batching and alias abuse, query depth and cost, and injection through arguments.

How is this different from a web application test?

Web testing focuses on what a browser user can reach; API testing focuses on what any authenticated or unauthenticated client can call — including endpoints that never appear in the UI, such as partner, mobile and legacy versioned APIs.

Ready to test your application?

Start a scoping conversation about api security for your systems.

Request a Security Assessment Talk to a Security Expert