There is a Cross Site Scripting (XSS) vulnerability in the "theme" parameter of preview.php in PHPJabbers Time Slots Booking Calendar v3.3.

In PHP Jabbers Time Slots Booking Calendar 3.3 , lack of verification when changing an email address and/or password (on the Profile Page) allows remote attackers to take over accounts.

User enumeration is found in in PHP Jabbers Time Slots Booking Calendar v3.3. This issue occurs during password recovery, where a difference in messages could allow an attacker to determine if the user is valid or not, enabling a brute force attack with valid users.

Improper input validation of password parameter in PHP Jabbers Time Slots Booking Calendar v 3.3 results in insecure passwords.

There is a Cross Site Scripting (XSS) vulnerability in "cid" parameter of preview.php in PHPJabbers Time Slots Booking Calendar v3.3.