An issue was discovered in CMS Made Simple 2.2.8. In the module FrontEndUsers (in the file class.FrontEndUsersManipulate.php or class.FrontEndUsersManipulator.php), it is possible to reach an unserialize call with an untrusted __FEU__ cookie, and achieve authenticated object injection.
CMS Made Simple 2.2.10 has a Self-XSS vulnerability via the Layout Design Manager "Name" field, which is reachable via a "Create a new Template" action to the Design Manager.
CMS Made Simple 2.2.10 has XSS via the 'moduleinterface.php' Name field, which is reachable via an "Add Category" action to the "Site Admin Settings - News module" section.