Whatever that means.
This would never have happened in the first place had they used an encrypted complex password and a simple password manager.
The whole company takes the hit with blunders like this. It's everyone's fault responsible for the infrastructure allowing this to happen in the first place. Those who pass the blame on others very quickly are equally to blame which means the CEO is just as to blame as the 'intern'.
Clearly the whole company doesn't train their interns.