Earlier quoted context omitted.
> And then go on to write paragraphs of detail and a timeline that explicitly shows for a five day period an unauthorized user had full super user access to the service. it sounds like they built the support tool (with its unfortunate name) such that it places limited trust in support contractors and the information technology that supports them. because of this they're able to identify potentially affected customers…
A person who should not have had access to the system gained near full admin access for five whole days. That is the textbook definition of a breach of security. It doesn't matter if they did it by fooling or paying a low level CS rep to get access to their account vs. using their 'leet hacking skillz' to pwn the electronic defenses. A breach is a breach and the CSO of all people has to own up to that fact.
"This is an application built with least privilege in mind to ensure that support engineers are granted only the specific access they require to perform their roles. They are unable to create or delete users. They cannot download customer databases."
not being able to create or delete users seems a far cry from "near full admin access."