graphql-and-hidden-parameters

To find hidden GraphQL fields and undocumented parameters, execute schema introspection queries and pivot to error-based type probing when introspection is restricted, deriving undocumented fields from observed errors and client requests to systematically map the schema.

Testing GraphQL authorization gaps involves querying object fields with victim identifiers to detect IDOR-style access, and validating nested authorization inconsistencies across related fields and input types including batching scenarios.

When GraphQL introspection is disabled, enumerate the schema by performing graceful fallbacks to type-specific probing and error-based discovery, extracting additional fields from error messages and observed frontend or mobile client requests.

You can detect undocumented admin-only fields by identifying mismatches between private documentation and the public schema, investigating permissive schema patterns and richer request bodies exposed by frontend or mobile application code.

Testing GraphQL batching behavior for authorization inconsistencies requires executing multiple queries in a single request, validating nested authorization behavior across related fields and input types during black-box pentesting to expose IDOR-like object access.