CVE-2018-15886: Monstra

High severity, CVSS 7.2. EPSS: 1.6% chance of exploitation in the next 30 days.

Monstra CMS 3.0.4 does not properly restrict modified Snippet content, as demonstrated by the admin/index.php?id=snippets&action=edit_snippet&filename=google-analytics URI, which allows attackers to execute arbitrary PHP code by placing this code after a <?php substring.

Affected products

• Monstra Monstra: version 3.0.4 only

Published 2018-09-10. Last modified 2026-06-17.