idor

Create two accounts per role, intercept sensitive requests with a proxy like Burp Suite, and swap object IDs between sessions. If switching IDs grants access to another user's data or lets you modify it, you have found an IDOR.

Burp Suite extensions like Autorize, AuthMatrix, and Auto Repeater compare responses across user roles. Specialized tools include Arjun for hidden parameter discovery, RESTler for REST API fuzzing, and Pynt or StackHawk for CI-based BOLA testing.

Decode base64 or hex encoded IDs before modifying them, collect legitimate hashed IDs and map them to users, or harvest predictable identifiers from API responses, JavaScript sources, and error messages. You can also try adding IDs the request never asked for.

Yes. For GraphQL, swap id arguments in queries and mutations and test batched or aliased queries for per-field authorization gaps. For gRPC, test with grpcurl and fuzzers since IDs live in binary protobuf messages.

Horizontal IDOR means accessing resources of another user at the same privilege level, such as reading a peer's profile. Vertical IDOR means reaching resources that require higher privileges, such as invoking administrative functions as a regular user.

Only test applications you are authorized to assess, such as in-scope bug bounty targets or contracted pentest environments. Automated enumeration of IDs against production systems without permission can violate laws and terms of service.