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Web Application & API Security

Web Application & API Penetration Testing

Agent47 Labs tests modern web applications and their APIs the way an attacker would — probing authentication, authorization, session handling, and business logic across REST and GraphQL. Where source is available, we combine runtime testing with whitebox source code review to surface issues black-box testing alone can miss, and back every finding with clear, reproducible evidence.

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What we test

Web Application Testing

Assess browser-facing applications and their supporting workflows from an attacker's perspective — across authentication, authorization, session management, input handling, business logic, and sensitive-data exposure.

API Penetration Testing

Assess REST and GraphQL APIs and backend services for weaknesses in identity, object- and function-level authorization, data handling, and application logic. Techniques are scoped to each API.

Whitebox / Source Code Review

Combine runtime testing with source-level review to identify security issues that can be difficult to discover through black-box testing alone.
  • Authorization flows & trust boundaries
  • Insecure data handling & dangerous patterns
  • Source-assisted validation of findings

What we validate

  • Authentication & Session Security

    Validate how users authenticate, maintain sessions, and recover or change account access.

  • Authorization

    Test whether users, roles, and API consumers can access functions or data outside their intended permissions.

  • Business Logic

    Evaluate workflows for assumptions and abuse cases that traditional scanners may miss.

  • Input & Data Handling

    Validate how applications and APIs process, trust, return, and protect data.

Ready to test your applications and APIs?

Validate the security of your web applications, APIs, authentication flows, business logic, and source implementation through human-led offensive testing.

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