Categorize API access-control failures into authentication, object authorization, tenant isolation, and data minimization.
Put each API security scenario into the boundary it most directly violates. Authentication missing/invalid Object authorization failure Tenant isolation failure Data minimization failure Endpoint accepts an expired bearer token and still returns profile data. User edits /projects/81 by guessing an ID from another team in the same tenant. Changing org_id in a request body exports another company’s users. Invoice response includes internal risk score for ordinary billing users. Webhook endpoint has no signature verification. Manager can access a direct report review they are not assigned to review. Search endpoint filters by caller role but not by organization. List endpoint returns…
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