API Security Review Stopped Data Exposure via Authorization Flaws
The Problem
The client had a growing API footprint and suspected endpoints were accessible beyond intended roles
Outcome
Identified and removed role bypass and ownership validation gaps across a large API surface
Quick Facts
Client type: Platform with mobile + web clients hitting a REST API Timeline:5–10 days depending on endpoint volume Testing type: API pentest (authz + business logic) Approach: Endpoint inventory + authorization matrix + manual abuse testingWhat Wolfcore did:
- Enumerated endpoints from API documentation, traffic analysis, and client-side code sources
- Built an authorization matrix (who should access what)/li>
- Tested for IDOR, role bypass, forced browsing, and hidden admin functionality
- Reviewed token lifetimes, refresh patterns, and logout invalidation
- Validated findings manually to remove false positives
Key findings (examples)
- Role bypass by modifying a parameter in an API request
- Object ownership not consistently validated on view/download endpoints
- Inconsistent authorization checks across API versions
- Debug or internal endpoints patterns that could leak if not gated properly
Impact
- Reduced risk of regulated or sensitive data exposure
- Replaced “patch everything” chaos with a repeatable authorization pattern fix
- Introduced guardrails for future endpoints (secure-by-default approach)
Deliverables
- Endpoint risk register grouped by feature area
- Abuse-case playbook (what an attacker tries first)
- Technical report with evidence and recommended fixes
- Retest support