CVE-2017-16798: Cmsmadesimple CMS Made Simple

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

In CMS Made Simple 2.2.3.1, the is_file_acceptable function in modules/FileManager/action.upload.php only blocks file extensions that begin or end with a "php" substring, which allows remote attackers to bypass intended access restrictions or trigger XSS via other extensions, as demonstrated by .phtml, .pht, .html, or .svg.

Affected products

• Cmsmadesimple CMS Made Simple: version 2.2.3.1 only

Published 2017-11-12. Last modified 2026-06-17.