CVE-2023-28475: Concretecms Concrete CMS

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Concrete CMS (previously concrete5) versions 8.5.12 and below, and versions 9.0 through 9.1.3 is vulnerable to Reflected XSS on the Reply form because msgID was not sanitized.

Affected products

• Concretecms Concrete CMS: before 9.2.0 (fixed in 9.2.0)

Published 2023-04-28. Last modified 2026-06-17.