CRLF/HTML entity injection with most recent version of PHPMyAdmin #16056

Describe the bug

The login form does not properly escape CRLF sequences, this can lead to HTML entity injection at the very least, or reflected XSS at the very worst.

To Reproduce

Steps to reproduce the behavior:

1. Go to ‘index.php’
2. Insert into the login fields, username, password, and the hidden field of target, and insert this value into those fields: %0D%0Astring%0D%0A and the login error will display the injected CRLF sequences, and injected url encoded entities, such as single or double quotes(double quotes are not as effective as single quotes).

Expected behavior

I expected the application to drop/filter out the CRLF sequences seeing as an issue similar was detected back in 2005.

Server configuration

• Operating system: Ubuntu
• Web server: Apache
• Database version: MySQL
• PHP version: most recent.
• phpMyAdmin version: most recent.

Client configuration

• Browser: Firefox
• Operating system: Windows 10