[20230501] Open Redirects and XSS within the mfa selection

Lack of input validation caused an open redirect and XSS issue within the new mfa selection screen.

This vulnerability affects the following application versions:

• Joomla 4.2.0
• Joomla 4.2.1
• Joomla 4.2.2
• Joomla 4.2.3
• Joomla 4.2.4
• Joomla 4.2.5
• Joomla 4.2.6
• Joomla 4.2.7
• Joomla 4.2.8
• Joomla 4.2.9
• Joomla 4.3.0
• Joomla 4.3.1