Cross-site request forgery (CSRF) vulnerability in administrator/index2.php in MOStlyCE before 2.4, as used in Mambo 4.6.3 and earlier, allows remote attackers to hijack the authentication of administrators for requests that add new administrator accounts via the save task in a com_users action, as demonstrated using a separate XSS vulnerability in mambots/editors/mostlyce/jscripts/tiny_mce/filemanager/connectors/php/connector.php.