CVE-2021-47964: Schlix CMS

High severity, CVSS 8.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Schlix CMS 2.2.6-6 contains a remote code execution vulnerability that allows authenticated attackers to execute arbitrary PHP code by uploading malicious extension packages through the block manager. Attackers can upload a crafted ZIP file containing PHP code in the packageinfo.inc file and trigger execution by accessing the About tab of the installed extension.

Affected products

• Schlix Schlix CMS: version 2.2.6-6 only

Published 2026-05-15. Last modified 2026-06-17.