andrzuk/FineCMS before 2017-03-06 is vulnerable to a reflected XSS in index.php because of missing validation of the action parameter in application/classes/application.php.Referenceshttps://github.com/andrzuk/FineCMS/commit/2c80de96d403d4a2e81ac4c48f358bdffbe85ea0https://github.com/andrzuk/FineCMS/issues/2