Offensive Business Logic Testing Methodology

Problem Solved

Business logic flaws hide between the developer's intended specification and what the system actually accepts. Scanners mostly match known patterns, so they miss assumptions about who can call a transition, from which state, with what inputs, and how many times. This skill provides an offensive testing method for breaking multi-step business flows into verifiable states and transitions, then finding flaws that chain into high-impact abuse.

How It Works

The core workflow is:
- Model each multi-step flow as a state machine, listing states, allowed transitions, and side effects
- For every transition, ask about caller identity, current state, input constraints, and call frequency
- Probe assumptions along the state, identity, input, and frequency axes
- Combine single-axis flaws into chains, since isolated issues are often low severity while chained abuse is critical
- Quantify financial impact per finding, for example loss-per-attack × scale

Boundaries: this is not an automated vulnerability scanner and does not replace code review or authorization-model analysis. It fits applications with payments, approvals, inventory, accounts, multi-step APIs, or other state-dependent flows. Use it when you can access the target endpoints, understand the business process, and prepare reproduction steps and impact evidence.