2018-11-21

In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but Internet Explorer render HTML elements in a .eml file, because of admin/upload-uploadify.php, and validate_safe_file in. Rated low severity (CVSS 3.8), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative cases in which HTML can be executed, such as a file with no extension or an unrecognized extension. Rated low severity (CVSS 3.8), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.