CMS Made Simple 2.2.15 contains a stored cross-site scripting vulnerability that allows authenticated users with Content Manager access to inject malicious scripts through SVG file uploads. Attackers can upload SVG files containing embedded JavaScript to the file manager, which executes when other authenticated users access the uploaded file, enabling cookie theft and session hijacking.

A vulnerability was found in CMS Made Simple up to 2.2.22. This impacts the function copyFilesToFolder in the library modules/UserGuide/lib/class.UserGuideImporterExporter.php of the component UserGuide Module XML Import. The manipulation results in path traversal. It is possible to launch the attack remotely. The exploit has been made public and could be used. This issue has been reported early to the project. They confirmed, that "this has already been discovered and fixed for the next release."

A security flaw has been discovered in CMS Made Simple up to 2.2.21. Impacted is an unknown function of the file admin/listusers.php of the component User Management Module. Performing a manipulation of the argument Message results in cross site scripting. The attack is possible to be carried out remotely. The exploit has been released to the public and may be used for attacks.

CMS Made Simple version 2.2.19 is vulnerable to Server-Side Template Injection (SSTI). The vulnerability exists within the Design Manager, particularly when editing the Breadcrumbs.

Incomplete blacklist vulnerability in javaUpload.php in Postlet in the FileManager module in CMS Made Simple 1.2.4 and earlier allows remote attackers to execute arbitrary code by uploading a file with a name ending in (1) .jsp, (2) .php3, (3) .cgi, (4) .dhtml, (5) .phtml, (6) .php5, or (7) .jar, then accessing it via a direct request to the file in modules/FileManager/postlet/.