Professional Web Application Penetration Testing
SaaS, APIs & Modern Web Apps | Secure Code | Protect Data
Modern web applications demand modern security testing. Our professional penetration testing services go beyond automated scans to discover business logic flaws, API vulnerabilities, authentication bypasses, and application-specific weaknesses in SaaS platforms, microservices, and cloud-native architectures. We test like real attackers to find what automated tools miss.
Critical Web Application Security Risks
Understanding vulnerabilities threatening modern web applications and business operations
API Security Failures
Broken authorization in REST, GraphQL, and microservices APIs exposing sensitive data, enabling unauthorized operations, and bypassing business logic. API vulnerabilities represent the fastest-growing attack vector in modern applications.
Multi-Tenant Isolation Breaches
SaaS application flaws allowing tenant-to-tenant data access, cross-customer privilege escalation, and shared resource exploitation. Single isolation failure compromises entire customer base and destroys business trust.
Business Logic Exploitation
Application-specific vulnerabilities in workflows, payment processing, inventory management, and user privileges that automated scanners cannot detect. Business logic flaws cause direct financial losses and operational disruption.
Authentication & Session Flaws
JWT token vulnerabilities, session fixation, OAuth misconfigurations, and SSO bypass techniques enabling account takeover and unauthorized access to sensitive application functionality.
Cloud-Native Vulnerabilities
Serverless function security gaps, container escape techniques, infrastructure-as-code misconfigurations, and cloud service integration weaknesses unique to modern cloud architectures.
Third-Party Integration Risks
Vulnerable dependencies, insecure API integrations, OAuth token leakage, and supply chain attacks through compromised third-party services integrated into applications.
Comprehensive Application Testing Services
Specialized security assessment for every modern web architecture
SaaS Platform Security
Multi-tenant isolation testing, subscription security, customer data separation, and privilege escalation prevention
- Tenant isolation validation
- Shared resource security
- Privilege escalation testing
- Data segregation verification
- Subscription bypass testing
- API authorization enforcement
API Security Testing
REST, GraphQL, SOAP, and microservices security assessment with authorization and rate limiting validation
- API authentication testing
- Authorization bypass attempts
- GraphQL introspection & injection
- Rate limiting validation
- Mass assignment vulnerabilities
- API versioning security
Single-Page Applications
React, Angular, Vue.js security testing covering client-side logic and state management vulnerabilities
- Client-side validation bypass
- DOM-based XSS testing
- State management security
- Token handling validation
- Client-side routing security
- WebSocket security testing
Authentication Systems
OAuth, SSO, SAML, JWT, and multi-factor authentication security assessment
- OAuth flow exploitation
- JWT token manipulation
- SSO bypass techniques
- SAML assertion testing
- MFA bypass attempts
- Session management flaws
Business Logic Testing
Application-specific vulnerability discovery requiring manual analysis and business context understanding
- Workflow bypass testing
- Payment manipulation
- Price tampering attempts
- Inventory manipulation
- Privilege escalation paths
- Data validation gaps
CI/CD Pipeline Security
DevSecOps integration with automated security testing in development pipelines
- Automated security scans
- Pre-deployment testing
- API contract validation
- Security gate integration
- Vulnerability tracking
- Continuous monitoring
Testing Methodologies
Flexible approaches matching your development process and security requirements
Black-Box Testing
External attacker perspective with no internal knowledge. Tests application security from public-facing attack surface discovering vulnerabilities exploitable by real-world attackers.
Best for: Pre-release security validation, compliance requirements, third-party security assessment, and realistic attack simulation.
Grey-Box Testing
Partial application knowledge including architecture diagrams, API documentation, and test accounts. Balanced approach maximizing coverage while maintaining realistic attack scenarios.
Best for: Development teams seeking comprehensive testing with reasonable timeline, most cost-effective security assessment approach.
White-Box Testing
Full access to source code, architecture documentation, and system credentials. Deepest security analysis identifying code-level vulnerabilities and architectural weaknesses.
Best for: Secure code review, critical application assessment, compliance validation, and in-depth security analysis.
Continuous Testing Options
- Agile Integration: Sprint-based security testing integrated into development cycles
- CI/CD Pipeline Testing: Automated security scans with every deployment
- Quarterly Assessments: Regular manual pentests maintaining security posture
- PTaaS (Pentest as a Service): Ongoing testing with continuous vulnerability management
Our Testing Process
Structured methodology ensuring comprehensive application security coverage
Scoping & Planning
Define testing objectives, identify critical business functions, map application architecture, establish testing methodology (black/grey/white-box), and document rules of engagement.
Reconnaissance
Technology stack analysis, API endpoint discovery, authentication flow mapping, third-party integration identification, and attack surface enumeration.
Automated Assessment
OWASP Top 10 vulnerability scanning, dependency analysis, configuration review, and baseline security assessment identifying common weaknesses.
Manual Penetration Testing
Business logic vulnerability discovery, API authorization testing, authentication bypass attempts, privilege escalation testing, and application-specific flaw identification.
Exploitation & Impact
Proof-of-concept development demonstrating exploitability, impact assessment showing business consequences, and attack chain documentation.
Reporting
Executive summary for stakeholders, detailed technical findings with reproduction steps, risk-prioritized recommendations, and developer-focused remediation guidance.
Retest & Validation
Fix verification for critical and high-severity vulnerabilities, regression testing ensuring no new weaknesses, and final security posture assessment.
Comprehensive Deliverables
Professional documentation enabling rapid remediation and ongoing security
Executive Summary: Business-focused overview explaining security posture, critical risks, and immediate action requirements for leadership
Technical Report: Detailed vulnerability documentation with HTTP requests, payloads, screenshots, and step-by-step reproduction instructions
Risk Prioritization: CVSS scores combined with business impact analysis prioritizing fixes by actual risk to operations
Remediation Playbook: Developer-focused fix guidance with code examples, secure design patterns, and framework-specific recommendations
API Security Report: Dedicated API findings document with authorization matrix, endpoint-specific vulnerabilities, and integration security issues
Retest Verification: Follow-up testing confirming successful remediation without introducing new vulnerabilities
Compliance Evidence: Documentation formatted for SOC 2, PCI DSS, HIPAA audits with attestation letters
Security Scorecard: Visual dashboard showing security posture improvements and remaining risk areas
Proven Web Application Security Expertise
Real results from professional application testing
Frequently Asked Questions
Common questions about web application penetration testing
Web application testing focuses on complex functionality, business logic, APIs, authentication systems, and data processing rather than static content. Applications require testing of user workflows, multi-tenant architectures, API authorization, state management, and application-specific vulnerabilities that don't exist in simple websites. Our testing addresses SaaS platforms, microservices, and modern architectures.
Yes. We have extensive experience testing React, Angular, Vue.js, and other JavaScript frameworks. Our SPA testing covers: client-side validation bypass, DOM-based XSS, state management vulnerabilities, JWT token handling, client-side routing security, WebSocket security, and API integration testing. Modern applications require specialized techniques beyond traditional web testing.
Our API testing covers: authentication and authorization enforcement, rate limiting validation, input validation and injection testing, mass assignment vulnerabilities, API versioning security, GraphQL introspection and injection, data exposure issues, business logic flaws, and integration security. We test REST, GraphQL, SOAP, and custom API implementations with comprehensive endpoint coverage.
Absolutely. Multi-tenant testing is a specialty. We validate: tenant isolation and data segregation, cross-tenant privilege escalation, shared resource security, subscription bypass attempts, customer data access control, and API authorization across tenants. We require test accounts for multiple tenants to thoroughly validate isolation controls.
We offer multiple integration options: automated security scanning in CI/CD pipelines, API-driven testing integrated into deployment workflows, pre-production environment testing, security gate implementation preventing vulnerable code deployment, and webhook notifications for discovered issues. We support Jenkins, GitLab CI, GitHub Actions, CircleCI, and custom pipelines.
Black-box testing simulates external attackers with no internal knowledge—most realistic but limited coverage. Grey-box provides partial knowledge (architecture, test accounts)—balances realism with efficiency. White-box includes source code access—deepest analysis finding code-level flaws. Most clients choose grey-box for optimal cost-effectiveness and comprehensive coverage.
Timeline depends on complexity: simple applications (5-10 days), mid-size SaaS platforms (2-3 weeks), large enterprise applications (4-6 weeks), and complex multi-tenant systems (6-8 weeks). Factors include: API endpoint count, authentication complexity, business logic depth, integration quantity, and testing methodology. We provide detailed estimates during scoping.
Yes. Our continuous testing services include: sprint-based security reviews, automated testing in CI/CD pipelines, quarterly manual penetration tests, PTaaS (Penetration Testing as a Service) with ongoing vulnerability management, and security consulting during feature development. Perfect for agile teams requiring continuous security validation.
Business logic testing requires understanding your application's intended behavior. We: review business requirements and workflows, identify critical functions (payments, authentication, authorization), test unexpected input combinations, attempt workflow bypasses, validate authorization at every step, test edge cases and race conditions, and verify business rule enforcement. Manual testing is essential—automated scanners cannot understand business context.
Yes. Our OAuth/SSO testing covers: authorization code interception, token leakage, redirect URI validation bypass, state parameter manipulation, scope elevation, refresh token security, PKCE validation, and SSO assertion manipulation. We test major providers (Okta, Auth0, Azure AD, Google) and custom implementations with comprehensive flow analysis.
Web Application Testing Packages
Flexible testing options for every application complexity and budget
Basic Application
Best for: Small apps, MVPs, limited functionality
5-10 tester-days | 1-2 weeks
- OWASP Top 10 testing
- API security assessment
- Authentication testing
- Basic business logic review
- Grey-box methodology
- Technical report with PoCs
- Remediation guidance
- One round of retesting
SaaS & API Platform
Best for: SaaS applications, API platforms, e-commerce
10-25 tester-days | 2-4 weeks
- Comprehensive OWASP testing
- Multi-tenant security validation
- API authorization matrix
- Business logic deep-dive
- SPA & modern framework testing
- OAuth/SSO security assessment
- Executive & technical reports
- Developer remediation playbook
- Two rounds of retesting
- Priority support
Complex Platform
Best for: Enterprise apps, complex architectures, microservices
25-60 tester-days | 4-8 weeks
- Multi-application testing
- Microservices architecture review
- Advanced business logic testing
- Cloud-native security assessment
- CI/CD pipeline integration
- White-box code review option
- Compliance documentation
- Executive presentations
- Unlimited retesting
- Dedicated security engineer
- Ongoing consultation
PTaaS - Continuous Application Security
Ongoing testing with automated scans, quarterly manual assessments, and continuous vulnerability management. Starting at $3,000/month.
Explore PTaaSSecure Your Web Application Before Attackers Strike
Professional testing discovers business logic flaws and API vulnerabilities automated scanners miss
Trusted by 1,200+ applications for comprehensive security assessment
1,200+ Apps Tested | SaaS & API Expertise | Business Logic Testing
CI/CD Integration | Continuous Testing | Expert Remediation Support
