lib.php in PivotX 2.3.11 does not properly block uploads of dangerous file types by admin users, which allows remote PHP code execution via an upload of a .php file.
The smarty_self function in modules/module_smarty.php in PivotX 2.3.11 mishandles the URI, allowing XSS via vectors involving quotes in the self Smarty tag.
PivotX 2.3.11 allows remote authenticated Advanced users to execute arbitrary PHP code by performing an upload with a safe file extension (such as .jpg) and then invoking the duplicate function to change to the .php extension.