Security testing for fintech products
We test payment flows, account access, and transaction logic in a controlled scope with agreed test windows and synthetic data, so you can improve security without disrupting customers. AI features and MCP integrations can be included in the same scoped engagement.
Where fintech security is hardest to verify
Fintech products span identity, payments, and ledger integrity. Small workflow changes can create gaps that are hard to see in code review or compliance checks.
Transaction state and authorization drift
Multi-step flows like authorization, capture, refunds, and disputes can allow actions to happen out of order or without the right checks.
Clarity we provide: We validate state transitions and role-based controls across every flow.
Account access and recovery paths
Password resets, device changes, and support workflows are common bypass paths when they are not tested end to end.
Clarity we provide: We test recovery, step-up authentication, and support tooling with real-world constraints.
Payment and banking integrations
Webhooks, partner APIs, and reconciliation jobs introduce blind spots in data integrity and access control.
Clarity we provide: We verify webhook validation, idempotency, and reconciliation controls.
Sensitive data exposure in logs and exports
Operational logs, exports, and internal reports can carry more data than intended.
Clarity we provide: We trace data paths to confirm least-privilege access and redaction.
What we test in fintech products
We model how attackers try to move money, change state, or take over accounts by chaining normal actions. That attacker perspective shapes the specific controls we validate in your product.
Payment and transaction flows
We follow the full lifecycle of authorization, capture, refund, and dispute to confirm state changes only happen when the right checks pass.
- Authorization ↔ capture state enforcement
- Refund and chargeback guardrails
- Race conditions in balance updates
- Amount and currency manipulation attempts
Account access and recovery
Attackers look for the easiest entry point, often in recovery or support paths. We test those routes end to end.
- Password reset and device change flows
- Session invalidation and token revocation
- Step-up authentication on risky actions
- Account enumeration protections
Fraud and abuse controls
We verify that fraud defenses still hold when identities or devices are manipulated to look legitimate.
- Velocity and rate-limit bypass attempts
- Device fingerprinting and binding gaps
- KYC/AML workflow bypasses
- Account linking and beneficiary abuse
APIs and third-party integrations
Partner APIs and webhooks expand the trust boundary. We validate authentication, replay defenses, and authorization scope.
- Webhook signature verification and replay protection
- Idempotency and duplicate event handling
- Partner API auth and scope enforcement
- Transfer initiation authorization checks
Findings that reinforce confidence in fintech controls
Each assessment highlights what is working and where controls need reinforcement, with clear remediation guidance your team can act on quickly.
State changes without explicit authorization checks
Secondary flows reused existing status flags, allowing state transitions to proceed without re-validating the caller's permissions.
Resolution: Enforce authorization on every transition and require role checks for each state.
Webhook replay accepted duplicate transaction events
Event processing trusted signed payloads but did not consistently enforce idempotency across retries.
Resolution: Verify signatures and persist event IDs to reject replays and duplicates.
Support tooling access broader than intended
Internal tools allowed balance and KYC updates from roles meant for read-only support workflows.
Resolution: Apply least-privilege role scopes and add step-up authentication for sensitive actions.
Exports and logs contained full identifiers
Operational exports included complete account identifiers where partial masking was expected.
Resolution: Mask sensitive identifiers by default and restrict access to audit-only roles.
Compliance reporting you can rely on
We map testing results to the controls your auditors and regulators expect, with a consistent report format that keeps internal reviews straightforward and avoids surprises.
Fintech testing FAQs
Do you test in production or staging?
We prefer staging environments that mirror production. If production testing is required, we agree on scoped test windows, use test accounts with synthetic data, and coordinate every step with your team.
What evidence do we get after the assessment?
You receive a clear report with an executive summary, reproducible steps, affected assets, severity rationale, and fix guidance. We can also map findings to PCI DSS and SOC 2 controls for internal review.
How do you handle sensitive financial data?
We minimize data access, use the test data you provide, and limit evidence collection to what is necessary to validate a finding. Artifacts are encrypted, access is restricted, and we sign NDAs as standard practice.
Will the report support PCI DSS or SOC 2 audits?
Yes. We align findings to relevant controls and can provide a testing attestation for auditors. This complements your audit evidence rather than replacing a compliance assessment.
Next step
Talk through your fintech scope.
No commitment required.
Share the flows you want tested and any audit timelines. We will outline a safe, scoped plan and provide a fixed quote if it is useful.
Schedule a scoping callor view a sample report first