Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Multiple directory traversal vulnerabilities in PhpMyChat Plus 1.9 and earlier allow remote attackers to read arbitrary files via a .. (dot dot) in the ChatPath parameter to (1) avatar.php, (2) colorhelp_popup.php, (3) color_popup.php, (4) index.php, (5) index1.php, (6) lib/connected_users.lib.php, (7) lib/index.lib.php, and (8) phpMyChat.php3; and the (9) L parameter to logs.php. NOTE: CVE analysis suggests that vector 1 might be incorrect.
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.