CVE-2023-44766: Concretecms Concrete CMS

Medium severity, CVSS 4.8. EPSS: 0.6% chance of exploitation in the next 30 days.

A Cross Site Scripting (XSS) vulnerability in Concrete CMS v.9.2.1 allows an attacker to execute arbitrary code via a crafted script to the SEO - Extra from Page Settings. NOTE: the vendor disputes this because this SEO-related header change can only be made by an admin, and allowing an admin to place JavaScript there is an intentional customization feature.

Affected products

• Concretecms Concrete CMS: version 9.2.1 only

Published 2023-10-06. Last modified 2026-06-17.