A cross-site scripting (XSS) vulnerability in flatCore-CMS v2.1.0 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the Username text field.
Remote Code Execution (RCE) vulnerabilty exists in FlatCore-CMS 2.0.7 via the upload addon plugin, which could let a remote malicious user exeuct arbitrary php code.
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.
acp/core/files.browser.php in flatCore 1.4.7 allows file deletion via directory traversal in the delete parameter to acp/acp.php. The risk might be limited to requests submitted through CSRF.