Camaleon CMS

Camaleon CMS versions 2.1.1 through 2.9.1 are vulnerable to authenticated remote code execution where an attacker with `custom_fields manage` permission can execute arbitrary Ruby code by injecting a malicious expression into the `select_eval` custom field type's options command parameter, which is then evaluated via `instance_eval` within an ERB view when a post edit page is rendered, leading to server-side code execution with web server process privileges.