CVE-2021-40555: Flatcore

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

Cross site scripting (XSS) vulnerability in flatCore-CMS 2.2.15 allows attackers to execute arbitrary code via description field on the new page creation form.

Affected products

• Flatcore Flatcore: version 2.0.7 only

Published 2023-02-16. Last modified 2026-06-17.