User enumeration is found in PHPJabbers Taxi Booking Script v2.0. 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.
https://www.phpjabbers.com/taxi-booking-script/
https://medium.com/%40mfortinsec/multiple-vulnerabilities-in-phpjabbers-part-3-40fc3565982f