Permissions, Privileges, and Access Controls
CS Guestbook stores sensitive information under the web root with insufficient access control, which allows remote attackers to obtain the admin name and MD5 password hash via a direct request for base/usr/0.php.
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.