Service · APIs

API security testing

APIs connect your web apps, mobile apps, partners and internal systems, and they are the layer most modern breaches target. We test REST, GraphQL and SOAP APIs for the authorization and data-exposure flaws attackers look for first.

OWASP API Security Top 10 · OWASP ASVS · PCI DSS · ISO/IEC 27001 · UAE IA (NESA)

Overview

Every endpoint is a direct line to your data

Unlike a web page, an API hides nothing behind a user interface. If an endpoint returns another customer's record when a single number is changed, an attacker will find it, usually with a script.

We test your APIs manually and with purpose-built tooling, guided by the OWASP API Security Top 10. Testing covers each user role and how your APIs behave when they receive input nobody planned for.

What you receive

  • Executive summary for leadership, with an overall risk rating
  • Technical findings with severity (CVSS), evidence and step-by-step reproduction
  • Remediation guidance your developers and engineers can act on
  • Debrief call to walk your team through the results
  • Complimentary re-test to confirm each issue is fixed
Scope

What we test

Object & function-level authorization

Whether one user can read or change another user's data, or call admin-only functions (BOLA/IDOR and BFLA).

Authentication

API keys, OAuth 2.0 and OpenID Connect flows, JWT handling and token lifetimes.

Excessive data exposure

Responses that return more data than the client needs, including sensitive fields.

Injection & input handling

SQL, NoSQL and command injection, mass assignment and unsafe deserialization.

Rate limiting & abuse

Brute force, enumeration and resource exhaustion through missing limits.

GraphQL specifics

Introspection, query depth and batching attacks, and field-level authorization.

How it works

The Digital Fortress protocol

Every engagement follows a disciplined, repeatable protocol, governed by signed rules of engagement so your operations stay protected throughout.

Phase 01

Reconnaissance & planning

We map your footprint, confirm targets and agree scope and rules of engagement in writing.

Phase 02

Identification & analysis

Automated scanning plus deep manual analysis pinpoints weaknesses, including business-logic flaws tools miss.

Phase 03

Exploitation & validation

Under controlled conditions we safely exploit findings to prove real-world impact, with no disruption.

Phase 04

Reporting & re-test

Executive and technical reports, a debrief with your team, and a complimentary re-test to confirm every fix.

Standards & frameworks

Mapped to the standards you report against

Findings are mapped to the frameworks your auditors and regulators use, so the report also works as compliance evidence.

OWASP API Security Top 10OWASP ASVSPCI DSSISO/IEC 27001UAE IA (NESA)
FAQ

Frequently asked questions

What do you need to test our API?

API documentation (OpenAPI/Swagger, a Postman collection or a GraphQL schema), credentials for each role, and a test environment if one exists. Without documentation, we can map the API from the application that uses it.

Do you test REST and GraphQL APIs?

Yes, both, as well as SOAP and gRPC services. GraphQL APIs get extra checks for introspection, query complexity and field-level authorization.

How is API testing different from web application testing?

They overlap, but an API test goes endpoint by endpoint and role by role, which is where authorization flaws hide. Many clients scope both together.

Can you test internal or partner APIs?

Yes. Internal, partner and public APIs can all be tested, remotely through a VPN or jump host if they are not exposed to the internet.

Related services

Often scoped together

Web App Penetration Testing

Uncover vulnerabilities in public-facing and internal web platforms before attackers reach them, including injection, broken auth, and logic flaws.

Mobile App Penetration Testing

Secure iOS and Android apps from design through deployment across every attack surface, including storage, transport, and runtime.

Cloud Security Assessment

Protect data integrity and confidentiality across AWS, Azure, Google Cloud, and private infrastructure, from misconfiguration to identity.

Secure Software Development

We don't just test software, we build it. Custom web, mobile, API and cloud software engineered secure from the first line of code, with security woven through every stage of the SDLC.

Not sure where you're exposed?

Start with a free scoping call. We'll map your real attack surface and recommend the right engagement, with a fixed quote.