Permissions, Privileges, and Access Controls
add.php in MyBlog 0.9.8 and earlier allows remote attackers to bypass authentication and gain administrative access by setting a cookie with admin=yes and login=admin.
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.