A steadily growing phishing trend involves phishing emails which attempt to modify your OAuth permissions. Simply clicking on one Allow button or hitting ENTER by mistake can significantly and semi-permanently allow a whole lot of maliciousness. OAuth is a widespread framework and standard which allows a single authenticated sign-on to work across multiple participating apps/sites/services. The average Internet user has nearly 180 websites they authenticate to. Thats a lot of separate login names and passwords for anyone to remember.”]
Source: https://blog.knowbe4.com/watch-out-for-oauth-phishing-attacks-and-how-you-can-stay-safe