CVE-2021-22953: Concretecms Concrete CMS

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

A CSRF in Concrete CMS version 8.5.5 and below allows an attacker to clone topics which can lead to UI inconvenience, and exhaustion of disk space.Credit for discovery: "Solar Security Research Team"

Affected products

• Concretecms Concrete CMS: up to and including 8.5.5

Published 2021-09-23. Last modified 2026-06-17.