CMS Made Simple (CMSMS) through 2.2.6 allows PHP object injection because of an unserialize call in the _get_data function of \lib\classes\internal\class.LoginOperations.php. By sending a crafted cookie, a remote attacker can upload and execute code, or delete files.

CMS Made Simple (CMSMS) through 2.2.6 contains an admin password reset vulnerability because data values are improperly compared, as demonstrated by a hash beginning with the "0e" substring.

CMS Made Simple (CMSMS) through 2.2.7 contains an arbitrary file deletion vulnerability in the admin dashboard via directory traversal sequences in the val parameter within a cmd=del request, because code under modules\FilePicker does not restrict the val parameter.

CMS Made Simple (CMSMS) through 2.2.7 allows physical path leakage via an invalid /index.php?page= value, a crafted URI starting with /index.php?mact=Search, or a direct request to /admin/header.php, /admin/footer.php, /lib/tasks/class.ClearCache.task.php, or /lib/tasks/class.CmsSecurityCheck.task.php.

CMS Made Simple (CMSMS) through 2.2.6 contains a privilege escalation vulnerability from ordinary user to admin user by arranging for the eff_uid value within $_COOKIE[$this->_loginkey] to equal 1, because an SHA-1 cryptographic protection mechanism can be bypassed.

CMS Made Simple (aka CMSMS) 2.2.7 has CSRF in admin/moduleinterface.php.

CMS Made Simple (aka CMSMS) 2.2.7 has Stored XSS in admin/siteprefs.php via the metadata parameter.

CMS Made Simple (aka CMSMS) 2.2.7 has Reflected XSS in admin/moduleinterface.php via the m1_version parameter.

CMS Made Simple (aka CMSMS) 2.2.7 has CSRF in admin/siteprefs.php.

CMS Made Simple (aka CMSMS) 2.2.7 has Reflected XSS in admin/moduleinterface.php via the m1_name parameter, related to moduledepends, a different vulnerability than CVE-2017-16799.