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OFFENSIVE SECURITY8 min read• August 2026
Bypassing BOLA/IDOR in GraphQL & REST Microservices
"Broken Object Level Authorization (BOLA/IDOR) remains the #1 vulnerability on the OWASP API Security Top 10. Automated scanners regularly miss these flaws because understanding object ownership requires stateful business context."
1. Why Automated Scanners Miss BOLA
Automated scanners send HTTP requests with a single token and look for 200 OK responses. They lack the logic to test whether User A (Organization X) can access resource IDs belonging to User B (Organization Y). Discovering true BOLA requires dual-account matrix testing.
2. GraphQL Specific Attack Vectors
GraphQL APIs exacerbate authorization complexity due to nested queries, alias wrapping, and global node IDs. Security testing must evaluate field-level authorization resolves across deeply nested queries.
3. Engineering Remediation
Authorization checks must be enforced authoritatively at the data-access / repository layer for every query, rather than relying solely on route-level middleware.
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