Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Directory traversal vulnerability in Pro Chat Rooms 3.0.2 allows remote authenticated users to select an arbitrary local PHP script as an avatar via a .. (dot dot) in the avatar parameter, and cause other users to execute this script by using sendData.php to send a message to (1) an individual user or (2) a room, leading to cross-site request forgery (CSRF), cross-site scripting (XSS), or other impacts.
CWE-22 - Path Traversal
Path traversal (or directory traversal), is a vulnerability that allows malicious users to traverse the server's root directory, gaining access to arbitrary files and folders such as application code & data, back-end credentials, and sensitive operating system files. In the worst-case scenario, an attacker could potentially execute arbitrary files on the server, resulting in a denial of service attack. Such an exploit may severely impact the integrity, confidentiality, and availability of an application.