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testing-api-for-broken-object-level-authorization

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Tests REST and GraphQL APIs for Broken Object Level Authorization (BOLA/IDOR, OWASP API1:2023) by intercepting API calls, identifying object ID parameters (numeric IDs, UUIDs, slugs), and systematically substituting IDs belonging to other users to check whether the server enforces per-object authorization. Use when asked to test BOLA or IDOR in an API, verify object-level authorization, or assess an API for access control bypass.

skills/testing-api-for-broken-object-level-authorization/SKILL.md

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# Testing API for Broken Object Level Authorization

## When to Use

- Assessing REST or GraphQL APIs that use object identifiers in URL paths, query parameters, or request bodies
- Performing OWASP API Security Top 10 assessments where API1:2023 (BOLA) must be tested
- Testing multi-tenant SaaS applications where users from different tenants should not access each other's data
- Validating that API endpoints enforce per-object authorization checks beyond just authentication
- Evaluating APIs after new endpoints are added to ensure authorization middleware is applied consistently

**Do not use** without written authorization from the API owner. BOLA testing involves accessing or attempting to access other users' data, which requires explicit permission.

## Prerequisites

- Written authorization specifying the target API endpoints and scope of testing
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