CVE-2026-21861: Basercms

High severity, CVSS 7.2. EPSS: 2.3% chance of exploitation in the next 30 days.

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. This issue has been patched in version 5.2.3.

Affected products

• Basercms Basercms: before 5.2.3 (fixed in 5.2.3)

Published 2026-03-31. Last modified 2026-06-17.