I got an email for Uber saying my account was accessed from Vietnam and I need to change my password. I verified if this was not a phishing attack and later wen

I got an email for Uber saying my account was accessed from Vietnam and I need to change my password. I verified if this was not a phishing attack and later went ahead and changed my password. I got my email verification though. But I find it strange, that my account was accessed. This raises some concerns.