business-logic-vuln

Business logic vulnerabilities are security flaws caused by how application rules and state transitions interact across multiple steps, rather than classic input parsing or injection errors. They exploit workflow sequencing, check-then-act conditions, and cross-step authorization gaps.

To test for race conditions in multi-step workflows, map the business states and actions, then validate cross-step authorization and sequencing dependencies. Focus on windows where validation or permissions change between steps, such as during payments, approvals, or coupon redemption.

You need to map state machines when you suspect pricing, inventory, quota, invite, or trial weaknesses that only appear after multiple actions. Mapping state transitions helps identify missing or incorrectly ordered checks across the workflow that enable abuse.

Yes, you can detect cross-step authorization gaps in systems involving coupons and inventory by validating whether later actions are properly bound to earlier permissions or business conditions. This targets multi-step attacks where state transitions bypass intended authorization checks.

The best way to identify check-then-act sequencing flaws is to analyze the application's state-machine transitions for windows where authorization or validation changes between steps. This detects race conditions and sequence dependencies across multi-step processes like trials and approvals.

This approach specifically finds state transition vulnerabilities and workflow abuse issues, not parser-level input validation bugs. It targets business logic flaws by validating cross-step authorization, sequencing, and race window dependencies across multi-step application workflows.