phpFreeChat 1.7 and earlier allows remote attackers to cause a denial of service by sending a large number of connect commands.

phpFreeChat 1.3 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by themes/zilveer/style.css.php and certain other files.

Session fixation vulnerability in phpFreeChat 1.1 allows remote authenticated users to hijack web sessions by setting the session_id parameter to match the victim's nickid parameter.