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If you’ve ever had a toddler or a cat, you know they usually enjoy that box that an item comes in more than the item itself. In other words, you already know the first rule of business logic testing: the way people use applications isn’t logical.  

As a developer, you have a set idea about what your application should do based on the business needs and requirements. You know how people should use the application, but people aren’t as predictable as code. When testing for business logic vulnerabilities, you need to think creatively and anticipate the accidental threats people create when they do the unexpected. 

If you’re looking for a place to get started, you can turn to the Web Security Testing Guide (WSTG) from OWASP for some best practices around testing for business logic vulnerabilities. 

Why business logic vulnerability testing is challenging

Business logic vulnerabilities arise from a disconnect between a web application’s intended use cas