Web Application & API Security Testing
Identify complex access-control flaws, multi-tenant isolation gaps, and business-logic vulnerabilities across your customer portals, SaaS platforms, and backend APIs.
What We Examine
Modern web applications and APIs are the primary interface to sensitive enterprise data and customer workflows. Because every application implements custom business logic, role hierarchies, and stateful API sequences, automated DAST scanners routinely miss critical authorization bypasses and workflow manipulation flaws.
Elegant Infosec performs deep, manual Web Application and API Security Testing aligned with the OWASP Application Security Verification Standard (ASVS) and OWASP API Security Top 10. Our consultants inspect every authenticated role, API endpoint, token lifecycle, and transaction workflow to uncover vulnerabilities that automated tools cannot comprehend.
Why Organizations Engage Us
Broken object- and function-level authorization
Horizontal and vertical privilege escalation (IDOR/BOLA) in multi-tenant applications can allow one user or organization to access another’s records.
Shadow and undocumented API endpoints
Single-page applications (SPAs) and mobile backends often expose internal REST or GraphQL mutations lacking rate limiting or field-level authorization.
Business logic and workflow manipulation
Attackers manipulate multi-step checkout, approval, financial, or onboarding workflows in ways that are syntactically valid to a WAF.
Customer security questionnaires & release assurance
SaaS providers and digital enterprises must demonstrate rigorous application security testing before major product releases or enterprise onboarding.
Technical Boundaries & Control Layers
Authentication, Session & Identity Flows
- Login mechanisms, MFA implementation, password reset, and OAuth/OIDC/SAML SSO flows
- JWT implementation, session token entropy, cookie flags, and session invalidation
- Account enumeration, credential stuffing resilience, and brute-force protections
Authorization & Multi-Tenant Access Control
- Broken Object Level Authorization (BOLA / IDOR) and Broken Function Level Authorization
- Role-based (RBAC) and attribute-based (ABAC) boundary testing across all user tiers
- Cross-tenant data isolation verification in B2B SaaS environments
Input Validation, Injection & Client-Side Security
- SQL/NoSQL injection, OS command injection, Server-Side Request Forgery (SSRF), and XXE
- Cross-Site Scripting (XSS), Cross-Site Request Forgery (CSRF), and DOM security
- File upload validation, deserialization, and template rendering security
API Architecture & Business Logic
- REST, GraphQL, SOAP, and WebSocket endpoint security and mass assignment
- Race conditions, state manipulation, and business workflow bypass testing
- Security headers (CSP, HSTS, CORS policy) and error handling information disclosure
Examination Protocol
Model workflows, user roles, and API schemas
Review OpenAPI/Swagger specifications, Postman collections, and user role matrices to map all functional pathways and trust boundaries.
Intercept and analyze every request and state transition
Use manual proxy inspection across multiple test accounts to test authorization enforcement, parameter tampering, and input handling.
Evaluate multi-step transaction integrity
Test race conditions, out-of-sequence API calls, privilege escalation, and data exfiltration scenarios specific to your application’s domain.
Deliver HTTP request/response PoCs and code-level guidance
Provide exact curl/HTTP reproduction traces, framework-specific remediation patterns, and validation testing after patches are deployed.
Evidence & Reporting Outputs
Executive Application Security Summary
High-level assessment of application security posture, risk distribution, and release-readiness summary suitable for leadership and enterprise clients.
Developer-Focused Technical Findings Report
Detailed report featuring exact HTTP request/response captures, affected endpoints, OWASP/CWE mappings, and remediation guidance for your tech stack.
Remediation Verification Statement
Updated verification report confirming the closure status of vulnerabilities following engineering remediation.
Referenced Security Frameworks
Structured verification requirements across Level 1, Level 2, and Level 3 assurance depth.
Full coverage of critical web application and modern API vulnerability classes.
Standardized weakness classification and severity scoring calibrated with application context.
Common Procurement Questions
Should application testing be performed in staging or production?
We recommend conducting intrusive application and API testing in a staging or UAT environment that mirrors production configuration, allowing thorough testing of state-changing workflows without polluting production databases.
What do you need from our team to test an API?
Ideally, an OpenAPI/Swagger specification or Postman collection, along with two or more test accounts per user role (so we can rigorously test cross-user and cross-tenant authorization boundaries).
Do you provide a safe-to-share summary for our enterprise customers?
Yes. Alongside the confidential technical report containing reproduction steps for your developers, we can provide an Executive Assessment Summary detailing scope, methodology, and post-remediation status without exposing sensitive internal endpoint details.
Start your security assessment.
WHAT ARE YOU MISSING?
Tell us what you need assessed. We’ll help define the scope and next steps.