API Security Testing Services

Industries we served

Inditex
Dacia
Vueling Airlines
Iberia Airlines
Banca Transilvania
Eni
Repsol
Moncler
Kaufland
Dedeman
BBVA
Poste Italiane
Lidl
Telefonica
Pirelli
Ford Otosan
Men's Health Clinic
ParaMed
RH Insurance
SRJ CPA
Prasad & Company LLP
Negup
LowestRates.ca
Insurance-Canada.ca
Dharna CPA
CQL & Partners
CPA LLP
Cleveland Clinic Canada
Canada's Medical Clinic
Canada Clinics
Zemalt PVT LTD
Broadium
Utho

Why APIs Have Become a Primary Target for Attackers

APIs power the connections between your applications, partners, and customers, which makes them an attractive target for attackers looking for a direct path to your data. Many of the most damaging breaches in recent years started with a broken API endpoint that exposed data it should never have returned. API security testing services examine how your endpoints handle authentication, authorization, and data, the same areas attackers focus on first.

Testing aligned with the OWASP API Security Top 10 risks

Manual testing of authentication, authorization, and object-level access controls

Rate limiting, input validation, and mass assignment testing across all endpoints

Coverage for REST, GraphQL, and SOAP API architectures

What API Security Testing Protects You From

Prevent Unauthorized Data Access

Prevent broken object level authorization issues that expose other users' data

Minimize Excessive Data Exposure

Identify excessive data exposure where APIs return more information than necessary

Strengthen Authentication Security

Find authentication weaknesses that could allow account takeover or impersonation

Detect API-Specific Security Vulnerabilities

Protect against mass assignment and injection vulnerabilities specific to API logic

Enable Secure Integrations and API Ecosystems

Support secure third-party integrations and partner-facing API programs

Our API Security Testing Process

Our testers map your API surface in detail before manually testing each endpoint for the access control and logic issues that automated API scanners consistently miss.

API discovery and documentation review to map all endpoints and parameters

Authentication testing across all supported methods, including token-based authentication

Authorization testing to identify broken object level and function level access controls

Input validation testing for injection flaws across all parameters and headers

Business logic and rate limiting testing to identify abuse and automation risks

Data exposure analysis to confirm responses do not leak excessive information

Reporting with endpoint-level findings, proof-of-concept requests, and remediation steps

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API Security Testing Services We Provide

REST API Penetration Testing

Comprehensive manual testing of REST API endpoints for authentication, authorization, and data exposure vulnerabilities.

GraphQL Security Testing

Assessment of GraphQL schemas and resolvers for over-fetching, injection risks, and improper access controls.

Third-Party and Partner API Testing

Testing of APIs exposed to partners and vendors to ensure external integrations do not introduce unacceptable risk.

API Authentication and Token Security Review

In-depth review of how API keys, JWTs, and OAuth tokens are issued, validated, and revoked.

PlutoSec API Security Testing Services

Manual Testing Where Automated API Scanners Fall Short

Automated API scanners are good at flagging missing security headers, but they cannot tell whether one user can access another user's data through a poorly designed endpoint. That kind of finding requires a tester who understands the business logic behind the API. PlutoSec's testers manually work through your API surface using the OWASP API Security Top 10 as a framework, delivering findings that reflect real risk to your data and your customers.

What Our Clients Say

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Frequently Asked Questions

Get answers to common questions about our cybersecurity services and how we can protect your business.

1.Why does API security need its own dedicated testing approach?

APIs are often the direct path to your data, and a lot of the traffic never touches a browser, so traditional web scanners miss it entirely. We manually test for broken object level authorization, broken authentication, excessive data exposure, and rate limiting gaps, which line up with the OWASP API Security Top 10 and are consistently the issues that lead to real breaches.

2.Do you test REST, GraphQL, and SOAP APIs?

Yes. Each API style has its own quirks. GraphQL introduces risks around query complexity and introspection, while REST and SOAP have their own authorization and input handling pitfalls. Our testers adjust their approach based on the technology you are actually running.

3.What credentials or documentation do you need to test our API?

Ideally a current API specification like an OpenAPI or Postman collection, plus test accounts across different privilege levels so we can check for broken authorization between roles. If documentation is incomplete, we can also work from the live application and reverse engineer the endpoints as part of the engagement.

4.Can API testing be integrated into our release cycle instead of a one-time engagement?

Yes. A lot of our clients move from a single annual test to a recurring or PTaaS style arrangement so new endpoints get checked before they reach production. We can talk through what cadence makes sense given how often your API changes.