CVE-2026-81904 Concrete CMS before 9.5.3 is vulnerable to Missing Authorization in Stack/Container Sub-Block Asset Registration

Concrete CMS below 9.5.3 registered view assets for every sub-block of a Stack, Container, or layout area without checking whether the requesting user could view that sub-block. An unauthenticated visitor could recover configuration values emitted by a restricted sub-block's asset registration —...

CVE-2026-81904

Concrete CMS below 9.5.3 is affected by a missing authorization flaw in the asset registration for sub-blocks within a Stack , Container , or layout area. The system registered view assets for every sub-block without verifying whether the requesting user had permission to view that sub-block, all...