idor

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

Burp Suite extensions like Autorize, AuthMatrix, and Auto Repeater compare responses across user roles. CI-native scanners such as Pynt and StackHawk auto-generate BOLA test cases, while Arjun helps discover hidden parameters.

Yes. GUIDs and hashed IDs only provide obfuscation, not authorization. Test by decoding base64 or hex values, harvesting leaked IDs from API responses, error messages, or JavaScript, and checking whether the server actually validates ownership.

Yes. In GraphQL, swap id arguments in queries, mutations, and batched requests while checking per-field authorization. For gRPC, use grpcurl and fuzzers to manipulate IDs in binary messages and verify authorization on every method.

Horizontal IDOR accesses resources of other users at the same privilege level, such as another customer's orders. Vertical IDOR reaches resources requiring higher privileges, like administrative endpoints, by manipulating identifiers or parameters.

Only test systems you own or have explicit written authorization to assess, such as in-scope bug bounty targets. Automated enumeration of IDs against production systems without permission can violate laws and terms of service.