In the current threat landscape, insecure APIs can lead to unauthorised access and damaging data breaches, undermining both your security and your reputation. Our service combines meticulous technical evaluations with a steadfast focus on regulatory compliance to uncover and mitigate vulnerabilities in your API infrastructure.
Our API penetration testing service delivers a detailed review of your API endpoints and integrations. We identify vulnerabilities and ensure robust protection against cyber threats.
We simulate real-world attacks to expose vulnerabilities, ensuring that your APIs remain secure against sophisticated threat actors.
Ensure your API security measures comply with regulatory standards and best practices to protect sensitive information.
API penetration testing is an authorised, simulated attack against your APIs - REST, GraphQL, SOAP, or gRPC - to identify vulnerabilities that expose data, allow unauthorised access, or enable business logic abuse. Because APIs increasingly power mobile apps, web front-ends, integrations, and machine-to-machine communication, they've become a primary target for attackers - and traditional web application testing rarely provides sufficient coverage on its own.
Web application testing focuses on the front-end and its interactions - the pages users see, the flows they follow, the authentication they encounter. API testing focuses on the underlying endpoints - often significantly larger in surface area than the front-end suggests - with authorisation flaws, mass assignment vulnerabilities, and rate-limiting weaknesses that never appear through the UI.
Modern architectures typically need both, particularly where the same API serves multiple front-ends (web, mobile, partner integrations).
Yes - every API engagement covers the current OWASP API Security Top 10 categories, including broken object-level authorisation (BOLA), broken authentication, broken object property-level authorisation, unrestricted resource consumption, broken function-level authorisation, unrestricted access to sensitive business flows, server-side request forgery (SSRF), security misconfiguration, improper inventory management, and unsafe consumption of APIs. Reports map each finding to the OWASP category and CVSS severity, with remediation guidance specific to your API framework and architecture.
Ideally, API documentation (OpenAPI/Swagger spec, Postman collection, or equivalent), example requests covering all endpoints and roles, credentials for each user role you want tested, and a description of the business logic the API supports.
Documentation dramatically improves testing depth - undocumented endpoints get less coverage because testers have to discover them the same way an attacker would. Where documentation doesn't exist, our team can still test the API through discovery techniques, but we usually recommend generating or updating documentation as a first step.
Yes - each has distinct vulnerability classes. REST APIs are most vulnerable to broken object-level authorisation, mass assignment, and rate-limiting failures. GraphQL APIs introduce their own risks: query depth attacks, batching abuse, introspection exposure, and complex authorisation logic across nested resolvers.
SOAP APIs still have XML-specific vulnerabilities like XXE, WS-Security misconfigurations, and SAML abuse. Our team applies the appropriate testing methodology and OWASP guidance for whichever protocol your APIs use - including mixed environments where all three coexist.
Third-party APIs your application consumes are usually out of scope for authorisation reasons - you can't authorise testing against an API you don't own. However, we do test how your application handles third-party API responses, including trust assumptions, input validation on returned data, error handling, and credential storage for third-party access. Where third-party APIs are business-critical, we can also review your integration architecture and recommend testing coverage the third-party provider should be doing themselves.
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