negative-testing

Test API endpoints for information disclosure by probing error handling paths with malformed inputs and boundary conditions. This process surfaces unexpected behavior and data leakage, ensuring internal errors are not exposed to clients.

Negative testing is the systematic probing of application error paths using malformed inputs and boundary conditions. You need it during security testing to uncover inconsistent error formats, information disclosure, and unexpected behavior across in-scope endpoints.

Fuzz API boundary conditions by applying malformed inputs and unusual payloads across in-scope endpoints. Log the resulting errors and categorize them by severity to identify inconsistent error formats and unexpected behavior.

Yes, you need clearly defined test cases to effectively check malformed inputs and error handling. Defined test cases ensure consistent probing of boundary conditions and accurate logging of errors categorized by severity.

Categorize error handling gaps found during bug bounty testing by logging errors and assigning severity levels. Route high-impact issues to Phase 5 validation to drive further analysis and remediation of information disclosure.