Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Multiple directory traversal vulnerabilities in PNphpBB2 1.2i and earlier allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in the ModName parameter to (1) admin_words.php, (2) admin_groups_reapir.php, (3) admin_smilies.php, (4) admin_ranks.php, (5) admin_styles.php, and (6) admin_users.php in admin/.
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.