Permissions, Privileges, and Access Controls
The admin.php file in Rantx allows remote attackers to bypass authentication and gain privileges by setting the logininfo cookie to "<?php" or "?>", which is present in the password file and probably passes an insufficient comparison.
CWE-264 - Permissions Privileges and Access Controls
CWE 264 (permissions, privileges, and access controls) is not a weakness in and of itself, rather it is a category of weaknesses related to the management of permissions, privileges, and other security features used to perform access control. If not addressed, the weaknesses in this category allow attackers to gain privileges for an unintended sphere of control, access sensitive information, and execute arbitrary commands.