CVE-2018-17418: Monstra

High severity, CVSS 7.2. EPSS: 3.1% chance of exploitation in the next 30 days.

Monstra CMS 3.0.4 allows remote attackers to execute arbitrary PHP code via a mixed-case file extension, as demonstrated by the 123.PhP filename, because plugins\box\filesmanager\filesmanager.admin.php mishandles the forbidden_types variable.

Affected products

• Monstra Monstra: version 3.0.4 only

Published 2019-03-07. Last modified 2026-06-17.