CVE-2021-40097: Concretecms Concrete CMS

High severity, CVSS 8.8. EPSS: 2.5% chance of exploitation in the next 30 days.

An issue was discovered in Concrete CMS through 8.5.5. Authenticated path traversal leads to to remote code execution via uploaded PHP code, related to the bFilename parameter.

Affected products

• Concretecms Concrete CMS: up to and including 8.5.5

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