Case study • Finance
Regional Bank — API & Access Control Validation
A regional bank requested an assessment of customer-facing and partner APIs to reduce account takeover and data exposure risk while maintaining uptime.
API securityAccess controlOWASPFinance
Challenge
- Multiple API consumers with different access levels
- Risk of object-level authorisation weaknesses (BOLA)
- Need for clear remediation guidance for engineering teams
Approach
- API inventory and auth model review
- Structured negative/abuse testing aligned to OWASP API risks
- Validation of rate limits, token handling and error responses
Outcomes
- Identified and prioritised access control issues affecting sensitive endpoints
- Delivered remediation guidance and a verification plan
- Improved logging recommendations for detection and auditability
Deliverables
- Executive summary and risk ranking
- Technical findings with reproduction steps
- Remediation checklist and retest plan
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