Series A investors now routinely ask for a security audit report during due diligence. RBI-regulated fintechs must demonstrate OWASP compliance. And a single data breach can destroy the trust you spent years building. Here is your complete pre-Series A security testing checklist.
Why Fintech Is the Highest-Risk Category
Fintech apps handle the three things attackers want most: money, identity documents, and banking credentials. The attack surface is wide — mobile apps, web dashboards, APIs, webhooks, third-party integrations — and the regulatory stakes are high.
OWASP Top 10 for Fintech: 2026 Edition
Broken Access Control
Fintech Risk
Users accessing other users' account data, transaction history, or documents
How We Test It
IDOR testing on all API endpoints with user-specific resources
Cryptographic Failures
Fintech Risk
PAN data, Aadhaar numbers, bank account details stored or transmitted in plain text
How We Test It
TLS configuration scan, data-at-rest encryption audit
Injection (SQL, NoSQL)
Fintech Risk
Attacker extracts entire customer database via a single search field
How We Test It
Automated SQLMap scan + manual testing of all input fields
Insecure Design
Fintech Risk
Missing rate limiting on OTP endpoints (brute-forceable)
How We Test It
Threat modelling review of authentication and payment flows
Security Misconfiguration
Fintech Risk
S3 buckets with KYC documents publicly accessible
How We Test It
Cloud configuration audit (AWS/GCP/Azure security posture review)
Vulnerable Components
Fintech Risk
Outdated npm/pip packages with known CVEs in payment processing code
How We Test It
Dependency scan (Snyk, OWASP Dependency Check)
Auth & Session Failures
Fintech Risk
JWT tokens without expiry, weak session invalidation after logout
How We Test It
JWT analysis, session fixation, token replay testing
Data Integrity Failures
Fintech Risk
Unsigned CI/CD pipeline artifacts allowing supply chain attacks
How We Test It
Code signing review, pipeline security audit
Logging & Monitoring Failures
Fintech Risk
No alerts on 100 failed login attempts — attacker goes undetected
How We Test It
Security monitoring review, alert threshold testing
SSRF
Fintech Risk
Internal AWS metadata endpoint exposed via user-supplied URL parameter
How We Test It
SSRF payload testing on all URL-accepting inputs
Fintech-Specific Checklist (Beyond OWASP)
What to Expect from a BTQA Security Audit
What We Deliver
- → Full OWASP Top 10 assessment report
- → Risk-rated findings (Critical/High/Medium/Low)
- → Proof-of-concept for each critical finding
- → Remediation roadmap with priority order
- → Retest after you fix all critical/high issues
- → Investor-ready security audit certificate
Timeline & Cost
- → Duration: 2–3 weeks
- → Starting from ₹40,000 (one-time)
- → Includes web app + API + mobile
- → Retest included in price
- → NDA signed before engagement begins
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