In Metinfo 6.1.3, include/interface/applogin.php allows setting arbitrary HTTP headers (including the Cookie header), and common.inc.php allows registering variables from the $_COOKIE value. This issue can, for example, be exploited in conjunction with CVE-2018-19835 to bypass many XSS filters such as the Chrome XSS filter.
MetInfo 6.0.0 allows a CSRF attack to add a user account via a doaddsave action to admin/index.php, as demonstrated by an admin/index.php?anyid=47&n=admin&c=admin_admin&a=doaddsave URI.
Metinfo v6.0.0 allows remote attackers to write code into a .php file, and execute that code, via the module parameter to admin/column/save.php in an editor upload action.