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The `/login` endpoint could be used to produce a UI sign-in webpage with custom error messages. To do this you should simply add the `loginErrorMessage` variable in your GET request:
```
&loginErrorMessage=Account%20Blocked%0APlease%20send%20your%20Email%20and%20Password%20to%20xyz@abc.com%20to%20unblock%20your%20account.
```
(Note that this variable is not even reported in your official [documentation](https://docs.aws.amazon.com/cognito/latest/developerguide/login-endpoint.html) )

Thisbehaviour could be exploited by an attacker to create URLs for phishing purposes.

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