API Penetration Testing
Modern applications rely on APIs to connect services, share data and power user experiences. EJN Labs helps organizations secure their APIs by identifying and validating critical weaknesses in endpoint design, authentication and data handling before attackers can exploit them. Whether you expose REST, GraphQL or RPC interfaces, our tailored testing uncovers hidden flaws, provides clear remediation guidance, and ensures your API ecosystem is robust and reliable.
Why Choose EJN Labs
Certified Security Experts
Our team is made up of professionals with industry-recognized certifications such as OSCP, OSWE, and CEH.
Global Client Support
We work with clients around the world, offering flexible delivery options for different time zones and compliance needs.
Standards-Based Testing
Our methodology is aligned with industry best practices and security standards including OWASP Top 10 and ISO 27001.
Aftercare and Re-Testing
Once the assessment is complete, we stay involved to help interpret results and verify fixes through optional re-testing.
Securing Your APIs
API penetration testing simulates real-world attacks against your interfaces to find vulnerabilities in authentication, data validation, access controls and error handling. This process is critical for protecting sensitive data, maintaining service availability, and preserving trust in your integrations.
Specification & Authentication Review
We analyze your API definitions, authentication schemes and token management. This includes checking for improper OAuth flows, insufficient scope restrictions, missing replay protections and flawed session handling.
Dynamic Endpoint Testing
We interact with live API endpoints to uncover issues such as injection vulnerabilities, insecure deserialization, missing rate limits, business logic flaws and insecure error messages by combining automated tools with manual techniques.
Combining specification review with dynamic endpoint testing ensures a holistic view of your API security, covering design flaws, authentication weaknesses and runtime behavior.
API Security Assessment
Input Validation & Injection
Test query parameters, headers, JSON bodies and URL paths for SQL, NoSQL, command or XPath injection risks due to improper sanitization.
Authentication & Access Control
Verify enforcement of role-based access, privilege separation and correct handling of missing, expired or forged tokens across all endpoints.
Rate Limiting & Throttling
Assess protections against brute-force, enumeration and denial-of-service by testing rate limits, quotas, IP restrictions and back-off mechanisms.
Business Logic Flaws
Identify scenario-specific weaknesses where valid requests can be chained or manipulated to bypass intended workflows, escalate privileges or cause data corruption.
Data Exposure & Privacy
Examine responses for sensitive data leakage, excessive information in error messages, improper CORS settings or misconfigured logging that could reveal internal details.
Deployment & Configuration Risks
Review API gateway, load balancer and server settings for default credentials, weak TLS configurations, open management interfaces and missing security headers.
Dependency & Third-Party Risks
Audit all integrated libraries, frameworks and external services for known CVEs, over-permissive scopes or insecure integration patterns.
CI/CD & Automated Scanning Integration
Evaluate your pipeline’s ability to catch API vulnerabilities early—review automated tests, security gating, and alerting on newly introduced endpoints or schema changes.
Why API Penetration Testing Matters
EJN Labs conducts API penetration tests using techniques modeled on real-world threats. We uncover both technical and logical vulnerabilities, then deliver clear, prioritized reports that guide your development and operations teams toward effective fixes.
Build. Scale And Secure with EJN Labs.
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