CVE-2021-28998: Cmsmadesimple CMS Made Simple

High severity, CVSS 7.2. EPSS: 1.3% chance of exploitation in the next 30 days.

File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated attackers to gain a webshell via a crafted phar file.

Affected products

• Cmsmadesimple CMS Made Simple: up to and including 2.2.15

Published 2023-05-08. Last modified 2026-06-17.