UCMS 1.4.7 allows remote authenticated users to change the administrator password because $_COOKIE['admin_'.cookiehash] is used for arbitrary cookie values that are set and not empty.
An issue was discovered in UCMS 1.4.6 and 1.6. It allows PHP code injection during installation via the systemdomain parameter to install/index.php, as demonstrated by injecting a phpinfo() call into /inc/config.php.