CVE-2023-48648: Concretecms Concrete CMS

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because directories can be created with insecure permissions. File creation functions (such as the Mkdir() function) gives universal access (0777) to created folders by default. Excessive permissions can be granted when creating a directory with permissions greater than 0755 or when the permissions argument is not specified.

Affected products

• Concretecms Concrete CMS: before 8.5.13 (fixed in 8.5.13); from 9.0, before 9.2.2 (fixed in 9.2.2)

Published 2023-11-17. Last modified 2026-06-17.