Password Reset Does Not Confirm the Existence of an Email Address

How it was found

issue: 1.click forget password as driver or rider [https://login.uber.com/login] 2.input an email which not signed up! 3. press reset password. there will be 'We've sent you an email with a link to reset your password.' message.

because it can not verify email is signed up or not!

I'd tried with my personal email. I got the message in webpage but did not get any further email from Uber. is that another bug?