Error handling issues
Using OWASP ZAP, you can also check for error handling issues within the web application. You want to be able to give the user some sort of knowledge of what the issue may be, but not disclose too much information. For example, if someone is trying to log into a web site, and their password is wrong, you don't want to tell the user the password is incorrect, as that would let the other person know that the user name is correct, just not the password. How you would handle this would be to just say that the login credentials are incorrect.
Using OWASP, you can also scan for Error Disclosure issues. Below is a scan from the lab, and you will notice it found some of the issues:
If I browse to one of those pages, you can ...
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