CVE-2018-17418

CVE-2018-17418 is a critical arbitrary PHP code execution vulnerability affecting Monstra CMS version 3.0.4. It allows authenticated remote attackers to upload malicious files with mixed-case extensions (e.g., .PhP) due to improper handling of forbidden file types within the filesmanager plugin. This flaw carries a high CVSS score of 7.2, indicating that successful exploitation can lead to complete compromise of confidentiality, integrity, and availability of the affected system. While there is no evidence of active exploitation, public exploit code, or significant community discussion, its high severity and ease of exploitation for an authenticated attacker warrant immediate patching.