Fintech Core API Penetration Testing & Token Hardening
Full-scope authorized penetration test and API architecture hardening for a multi-tenant payment settlement gateway processing ₹45M+ daily volume.
Prior to enterprise SOC 2 audit, the client required an exhaustive white-box and gray-box assessment of their transaction processing API. The challenge was identifying latent business logic vulnerabilities, race conditions in ledger updates, and token hijacking vectors without causing payment stream latency.
RubaCore Labs executed a rigorous 14-day security engagement. We identified 3 critical authorization flaws (BOLA/IDOR in payout webhook endpoints) and simulated microsecond race conditions. We supplied exact cryptographic patch routines, implemented strict JWT replay protection with Redis bloom filters, and hardened IAM boundaries.
3 Critical, 5 High, 6 Medium findings patched & verified
Cleared enterprise third-party SOC 2 Type II audit
Replay mitigation added zero perceptible overhead
- •Target surface: 82 microservice endpoints spanning Node.js and Go runtimes
- •Cryptographic replay-protection engine using distributed Redis timestamps
- •Mutual TLS (mTLS) enforcement for high-value banking partner webhooks