Fintech API authorisation assessment
Anonymised pattern: API-heavy financial product with partner and customer roles.
Context
The security objective was to validate whether privilege boundaries held across customer, partner and internal support roles on REST APIs — especially money-adjacent and PII-bearing endpoints.
Approach
Mapped API surface from documentation and traffic, then manually tested vertical/horizontal privilege escalation, mass assignment and sensitive field exposure. Business-logic sequencing (state transitions) received dedicated time.
Outcomes (qualitative)
- Authorisation gaps documented with role matrices so developers could see failed expectations quickly
- Report framed for both engineering and a customer security questionnaire pack
- Retest cycle used to verify patched controls on the highest-risk endpoints
Note: regulated entities that contractually require CERT-In empanelment should verify that requirement separately — see our CERT-In guide.
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