API Security

API Security Testing

Secure your APIs before attackers exploit them. Our security experts thoroughly test your REST, GraphQL and SOAP APIs for vulnerabilities according to the OWASP API Security Top 10.

APIs are the backbone of modern applications - and the #1 target for hackers. We identify BOLA, authentication flaws, and business logic vulnerabilities before they are exploited.

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200+

API Pentests

Since 2020

1,200+

API Vulnerabilities

Identified

BOLA/IDOR

Most found issue

100%

OWASP Coverage

API Top 10

Why API Security Is Crucial

APIs (Application Programming Interfaces) form the nervous system of modern software. They connect your web application to the backend, expose data to mobile apps, integrate with partners and third-party services, and enable microservices architectures.

This central role also makes APIs the primary target for attackers. A vulnerable API provides direct access to your data and business logic, often without a UI or firewall in between. Research shows that API-related breaches have increased explosively in recent years.

Traditional web application security scans often miss API-specific vulnerabilities like Broken Object Level Authorization (BOLA), the #1 API vulnerability. BOLA means that attackers can access other users' data simply by changing an ID.

At JamaSec we combine deep API expertise with practical hacker mentality. We have built APIs, documented them, and now we break them - so you can fix them before attackers discover them for you.

OWASP API Security Top 10

We thoroughly test your APIs against all OWASP API Security Top 10 vulnerabilities

API1

Broken Object Level Authorization

Insufficient control whether a user has access to specific objects/records. The #1 API vulnerability.

API2

Broken Authentication

Weak authentication mechanisms allowing attackers to take over accounts or impersonate other users.

API3

Broken Object Property Level Authorization

Exposure of sensitive properties or ability to modify properties that should not be modifiable.

API4

Unrestricted Resource Consumption

No rate limiting or resource quotas enabling DoS attacks.

API5

Broken Function Level Authorization

Access to admin functions or endpoints that should not be available for the user role.

API6

Unrestricted Access to Sensitive Flows

No protection against automated abuse of critical business flows like password reset or checkout.

API7

Server Side Request Forgery

The server makes requests to attacker-controlled URLs, allowing access to internal systems.

API8

Security Misconfiguration

Insecure defaults, verbose errors, unnecessary features enabled, or missing security headers.

API9

Improper Inventory Management

Undocumented or forgotten API versions, endpoints, or debug functionality that are still active.

API10

Unsafe Consumption of APIs

Insufficient validation of responses from third-party APIs your application consumes.

API Types We Test

Each API type has unique vulnerabilities - we master them all

REST API Security Testing

Complete security assessment of your RESTful APIs. We test all CRUD operations, authentication flows, pagination, filtering, and business logic.

OWASP API Top 10CRUD operation testingAuthentication & AuthorizationRate limiting analysisInput validation

GraphQL API Security Testing

Specialized testing for GraphQL APIs with their unique attack surface. Introspection, query depth attacks, and more.

Introspection attacksQuery depth limitingBatching attacksField level authorizationAlias abuse testing

SOAP/XML API Security Testing

Security testing for legacy SOAP web services. XXE, WSDL analysis, and XML-specific vulnerabilities.

XXE injectionWSDL enumerationWS-Security testingXML signature attacksSOAP action spoofing

WebSocket Security Testing

Real-time communication security testing. Origin validation, message integrity, and session hijacking.

Origin validationMessage tamperingCross-site WebSocket hijackingDoS resilienceAuthentication persistence

Our API Security Testing Process

A structured methodology for maximum coverage of your API attack surface

Scope & Documentation

We collect API documentation (OpenAPI, Postman), identify all endpoints, and define the scope.

OpenAPI/Swagger analysis
Endpoint inventory
Authentication flows mapping
User roles identification

Reconnaissance

Automatic and manual discovery of endpoints, parameters, and hidden functionality.

Endpoint enumeration
Parameter discovery
Version detection
Technology fingerprinting

Authentication Testing

In-depth analysis of authentication mechanisms, token handling, and session management.

JWT analysis
OAuth/OIDC flow testing
Token manipulation
Brute force resilience

Authorization Testing

Systematic testing of all authorization checks, BOLA/IDOR, and privilege escalation.

Horizontal escalation
Vertical escalation
BOLA/IDOR testing
Role-based access control

Business Logic Testing

Analysis of business logic for abuse scenarios and unintended behavior.

Flow manipulation
Race conditions
Mass assignment
Input validation bypass

Reporting & Remediation

Comprehensive report with all findings, PoC requests, and concrete fix recommendations.

Executive summary
Technical details with curl examples
CVSS scores
Remediation prioritization

When API Security Testing?

API security testing is essential in these situations

New API Launch

Before publishing a new API to customers, partners, or internal teams.

After Major Updates

With new endpoints, changed authentication, or modified business logic.

Compliance Requirements

NIS2, ISO 27001, PCI-DSS and other standards require regular security assessments.

Third-Party Integrations

When consuming APIs from third parties or opening your APIs to partners.

Incident Follow-up

After a security incident to validate all vulnerabilities are closed.

Annual Security Audit

As part of your periodic security review and risk assessment cycle.

Frequently Asked Questions

Answers to the most asked questions about our API security services

What is the difference between API testing and web application testing?+

API testing focuses specifically on the programmatic interface, while web application testing tests the complete application including UI. API-specific vulnerabilities like BOLA, improper rate limiting, and API-specific authentication issues are often missed in traditional web app tests.

Do you need my API documentation?+

Documentation (OpenAPI/Swagger, Postman collections) is useful but not required. We can also discover endpoints via reconnaissance and traffic analysis. However, with documentation we can test more thoroughly and efficiently.

How long does an API security test take?+

This depends on the scope. A single API with 20-30 endpoints typically takes 3-5 days. Larger API landscapes with multiple services can take 2-4 weeks.

What does API security testing cost?+

Prices start from €4,000 for a basic API assessment. The exact price depends on the number of endpoints, complexity of business logic, and whether there are multiple API versions/environments.

Can you also advise on API monitoring/security tools?+

Yes, we advise on API gateways, WAFs with API-specific rules, runtime protection tools, and API security testing in CI/CD pipelines.

Ready to secure your APIs?

Discover vulnerabilities in your APIs before attackers do. Schedule a free consultation with our API security experts.