# API Penetration Testing - DSecure.me > Comprehensive REST, GraphQL, and SOAP API security testing. Protect your APIs from data breaches and unauthorized access. OWASP API Security Top 10 compliant assessments. Source: https://dsecure.me/en/api-pentest/ --- # API Penetration Testing Your APIs are the backbone of modern applications. Ensure they're secure from data exposure, unauthorized access, and abuse before problems arise. APIs have become the foundation of digital business. They connect your web applications, mobile apps, partner integrations, and internal systems. But this connectivity comes with risk - APIs expose business logic and data to the world, making them attractive targets for attackers seeking to steal information, manipulate transactions, or disrupt services. Unlike traditional web applications with visible interfaces, APIs operate behind the scenes, making security issues harder to detect but easier for attackers to exploit at scale. A single vulnerable API endpoint can expose millions of customer records, enable financial fraud, or give attackers access to your entire system. Our API penetration testing provides thorough security assessment of REST, GraphQL, SOAP, and other API architectures. We test from an attacker's perspective, identifying vulnerabilities in authentication, authorization, data exposure, rate limiting, and business logic. You'll understand exactly what data and functionality could be compromised and receive clear guidance on securing your APIs before they're exploited. ### Our Approach Our API penetration testing follows the OWASP API Security Top 10, the definitive framework for API security. Unlike the web-focused OWASP Top 10, the API Security Top 10 addresses risks specific to APIs - from broken object level authorization to improper assets management. We combine automated discovery tools with expert manual testing to identify vulnerabilities that automated scans miss. Our approach covers REST, GraphQL, SOAP, and WebSocket APIs, ensuring comprehensive security assessment regardless of your API architecture. All findings map to OWASP categories, making remediation straightforward for your development team. ### Get In Touch Email contact@dsecure.me Address ul. Na Grobli 12 bud. L3 pok. 021 50-421 Wrocław [About Us](/en/#about) ## What We Can Help With ### OWASP API Security Top 10 Assessment Comprehensive testing for the most critical API security risks We test for all OWASP API Security Top 10 vulnerabilities including broken object level authorization, broken user authentication, excessive data exposure, lack of resources and rate limiting, broken function level authorization, mass assignment, security misconfiguration, injection, improper assets management, and insufficient logging. This industry-standard framework ensures comprehensive coverage of the most critical API security issues. ### Authentication & Authorization Testing Verify secure access control and identity management We thoroughly test API authentication mechanisms including API keys, OAuth 2.0, JWT tokens, and custom authentication schemes. We look for token manipulation vulnerabilities, authentication bypass techniques, weak credential storage, and session management issues. We also test authorization logic to ensure users can only access data and functionality appropriate to their permission level, preventing privilege escalation and unauthorized data access. ### Broken Object Level Authorization (BOLA) Test for unauthorized access to other users' data and resources BOLA vulnerabilities allow attackers to access data belonging to other users by manipulating object identifiers. We systematically test every endpoint that accepts IDs or references, attempting to access resources belonging to other users or organizations. This is consistently the #1 API security risk and requires thorough manual testing that automated tools often miss. We help you implement proper authorization checks to protect sensitive data. ### Excessive Data Exposure Identify APIs returning more data than necessary Many APIs expose more information than needed, relying on client applications to filter sensitive data. We analyze API responses to identify excessive data exposure - personally identifiable information, internal system details, or business data that shouldn't be accessible. We examine whether APIs leak information about system architecture, database structures, or other technical details that could aid attackers. ### Rate Limiting & Resource Management Ensure APIs can't be abused through excessive requests We test whether your APIs properly limit request rates to prevent abuse, denial of service, and resource exhaustion. We attempt brute force attacks, credential stuffing, data scraping, and other abuse scenarios to verify that rate limiting and throttling mechanisms are properly implemented. We also test for business logic flaws that could allow attackers to bypass payment systems or abuse functionality through automated requests. ### GraphQL-Specific Security Issues Specialized testing for GraphQL API vulnerabilities GraphQL APIs have unique security considerations including query depth and complexity attacks, introspection exposure, batching attacks, and field-level authorization issues. We test for GraphQL-specific vulnerabilities that could allow denial of service through expensive queries, information disclosure through introspection, and unauthorized data access through nested queries. Our specialized expertise ensures comprehensive coverage beyond generic API testing. ### API Documentation & Security Configuration Review API documentation and security settings for vulnerabilities We examine your API documentation for information leakage, test for undocumented endpoints that may have weaker security, and verify that security headers and CORS policies are properly configured. We check for improper assets management - shadow APIs, old versions, and deprecated endpoints that may still be accessible. We also test whether verbose error messages expose system information that could help attackers. ## Ready to Get Started? Contact us for a free consultation and security assessment. ### Get Expert Advice Our cybersecurity experts are ready to discuss your specific needs and provide tailored solutions for your business. Email Us [contact@dsecure.me](mailto:contact@dsecure.me) [ Get in Touch Fill out our contact form ](/en/#contact) ## Related Services Explore our other cybersecurity and IT solutions. [ ### Web Application Penetration Testing Protect your web applications from cyber threats with comprehensive security testing following OWASP standards and best practices. Learn more ](../web-pentest/)[ ### Mobile Application Penetration Testing Secure your iOS and Android applications with comprehensive mobile security testing following OWASP MASVS standards. Learn more ](../mobile-pentest/)[ ### Threat Modelling Identify security risks before development begins. Build secure architectures from the ground up with expert threat modeling guidance. Learn more ](../threat-modelling/)