Consent phishing
Also known as Illicit consent grant
Tricking a user into approving a malicious application's access to their account data.
The user sees a genuine Microsoft or Google consent screen, because the request is genuine, and approves an application that then holds a token to read their mail and files. No password is involved, so resetting it changes nothing.
Blocking or restricting user consent for unverified applications, and reviewing what is already authorized in the tenant, are the two things that address it.
Where this comes up
Consent phishing sits inside our identity and access work. If you are trying to work out what this means for your own environment rather than in the abstract, that is the page worth reading next, and a short call will get you a straight answer faster than either.