CVE-2021-40104: Concretecms Concrete CMS

High severity, CVSS 7.5. EPSS: 1.4% chance of exploitation in the next 30 days.

An issue was discovered in Concrete CMS through 8.5.5. There is an SVG sanitizer bypass.

Affected products

• Concretecms Concrete CMS: up to and including 8.5.5

Published 2021-09-27. Last modified 2026-06-17.