A CSRF vulnerability was found in flatCore before 1.5, leading to the upload of arbitrary .php files via acp/core/files.upload-script.php.

An issue was discovered in flatCore 1.4.7. acp/acp.php allows remote authenticated administrators to upload arbitrary .php files, related to the addons feature.

flatCore-CMS 1.4.6 is vulnerable to reflected XSS in user_management.php due to the use of $_SERVER['PHP_SELF'] to build links and a stored XSS in the admin log panel by specifying a malformed User-Agent string.