CYBERSECURITY TESTING

API Security
Testing & Endpoint Assurance.

Secure the services that connect your applications, partners and data. APIs often expose business functions and data more directly than a user interface. World Computing tests whether each endpoint enforces the right identity, role, object and workflow rules.

Book Scoping Call → View Test Coverage

OWASP API Top 10Comprehensive Coverage

Auth & LogicBTL & Authorization

Zero DowntimeSafe Production Testing

ActionableDeveloper-Ready Findings

Re-testValidation of Remediations

WHAT IS API SECURITY TESTING?

Testing machine-to-machine interfaces and business services.

API security testing is a focused assessment of machine-to-machine interfaces and the business services behind them. It covers more than malformed input. The most serious weaknesses often arise when a valid user can request another user's object, call an administrator function, change a protected property or consume resources without effective limits.

We build an endpoint and role map from available specifications, collections, client applications and observed traffic. Automated requests support coverage, but manual reasoning is essential for authorisation and business-logic testing.

When This Service Is Useful

New or materially changed public, partner or mobile-backend APIs.
Multi-tenant platforms where data separation depends on object-level authorisation.
APIs supporting payments, bookings, identity, health, finance or sensitive workflows.
GraphQL or microservice environments with complex roles and service-to-service trust.
Legacy, versioned or undocumented endpoints that may still be reachable.
Organisations responding to an API disclosure, abuse pattern or assurance request.

COMPREHENSIVE COVERAGE

What we test.

Our assessment targets common API vulnerabilities, authentication mechanisms, authorization boundaries, and business logic.

SURFACE

Inventory & Attack Surface

Documented and observed endpoints, versions, methods, schemas, hidden functions, deprecated interfaces and management exposure.

AUTH

Authentication Controls

API keys, session tokens, OAuth/OIDC flows, token validation, expiry, revocation, audience, scope and service authentication.

OBJECT AUTH

Object-Level Authorisation

Verifying whether changing an identifier or key can expose or modify another user's, tenant's or customer's object (BOLA/IDOR).

FUNCTION AUTH

Function & Property Auth

Role separation, administrative function access, mass assignment flaws, and protection of sensitive object properties.

PARSER

Input & Parser Security

Injection vulnerabilities, unsafe deserialisation, content-type handling, file processing, schema validation and unexpected input structures.

RATE LIMITS

Resource & Rate Controls

Request limits, pagination controls, expensive query operations, batch functions, upload limits, and resource exhaustion paths.

LOGIC

Business Logic & Abuse

Sequence bypass, transaction manipulation, replay attacks, duplicate actions, race conditions and automation of legitimate functions.

CONFIG

Configuration & Trust

CORS settings, TLS configuration, error response leakage, excessive data exposure, server-side requests (SSRF), and unsafe webhooks.

METHODOLOGY

How the engagement works.

A structured 6-stage testing methodology aligned with the OWASP API Security Top 10:2023.

STAGE 01

Define API Estate

Agree base URLs, environments, versions, protocols, endpoints, roles, data types, integrations and excluded services.

STAGE 02

Prepare Identities & Data

Create test accounts, tokens, tenants, objects and workflow states that support multi-role and object-level testing.

STAGE 03

Build Coverage Map

Use specifications, collections and observed traffic to link endpoints to operations, roles and sensitive data.

STAGE 04

Test Controls & Abuse

Exercise authentication, authorisation, validation, rate limits and business logic with manual and automated requests.

STAGE 05

Validate Impact Safely

Confirm what data or action is exposed while minimising access and strictly avoiding real customer information.

STAGE 06

Report & Re-Test

Deliver an endpoint-aware findings report and verify remediated controls included in the re-test scope.

ENGAGEMENT DETAILS

Requirements & Deliverables.

Clear input specifications and developer-focused outputs delivered at engagement completion.

What We Need From You

OpenAPI/Swagger specs, GraphQL schemas, or Postman collections.
Base URLs and confirmation of environments and versions in scope.
Test users, tenants, API keys or tokens for each important role.
Representative test data and guidance on sensitive operations.
Architecture, authentication and integration details where available.

What You Receive

Executive summary explaining the most important data and workflow risks.
API scope and endpoint coverage summary, including material limitations.
Risk-rated findings with request/response evidence sanitised where necessary.
Clear identification of affected roles, objects, properties, functions and versions.
Reproduction steps suitable for developers and quality-assurance teams.
Remediation guidance addressing central policy enforcement and root causes.

Important Scope & Safety Note

API tests can create, alter or delete data quickly. We identify irreversible and high-volume operations during scoping, use dedicated test tenants and data where possible, and agree rate limits and exclusions. Testing never includes unapproved denial-of-service activity or access to other customers' data. Results are point-in-time and limited to the documented scope and roles.

WHY WORLD COMPUTING

Clear, evidence-led API testing.

Evidence-Led Reporting

Clear reporting designed for both technical development teams and executive decision-makers.

Risk-Proportionate Testing

Testing designed around your actual business risk, technology stack and operational constraints.

Actionable Remediation

Findings prioritised for remediation with practical guidance rather than alarmist language.

Collaborative Assurance

A collaborative approach that supports developers, infrastructure teams and service owners throughout.

COMMON QUESTIONS

API Security FAQ

Do you need an OpenAPI file or Postman collection?

Documentation greatly improves coverage and efficiency, but testing can begin from observed traffic or a client application. Undocumented endpoints may require additional discovery time and cannot always be proven complete.

How many test accounts are required?

At least one account for each important role is recommended, and two comparable users or tenants are often needed to test object-level separation.

Can you test GraphQL?

Yes. GraphQL testing considers schema exposure, resolver authorisation, object and field access, batching, query complexity and business logic in addition to standard authentication and input risks.

Is API testing included in a web penetration test?

A small supporting API may be included, but a large or externally consumed API deserves its own endpoint and role coverage plan. We define the boundary during scoping.

Can the test use production?

Sometimes, but dedicated test data and non-production environments are safer for destructive or high-volume operations. If production is necessary, the rules of engagement must tightly control actions and rate.

Will the report help developers fix central authorisation issues?

Yes. We group related symptoms where appropriate and explain the policy or design weakness behind them, rather than treating every affected endpoint as an unrelated problem.

EXPERT GUIDANCE

Cyber Testing - Practical guidance for a more secure business

Cyber Testing

Understanding Penetration Testing: Why It Matters

Discover vulnerabilities before attackers can exploit them. Clear technical findings, business-risk explanations, and actionable remediation recommendations.

Read full briefing →