CVE-2026-66748

Description

Camaleon CMS versions 2.1.1 through 2.9.1 contains an authenticated remote code execution vulnerability that allows users with custom_fields manage permission to execute arbitrary Ruby code by supplying a malicious expression through the select_eval custom field type. Attackers can store an attacker-controlled Ruby expression in the field options command parameter, which is evaluated via instance_eval within an ERB view whenever a post edit page is rendered, achieving server-side code execution with web server process privileges.

References

• https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5f
• https://github.com/owen2345/camaleon-cms/pull/1136
• https://github.com/owen2345/camaleon-cms/releases/tag/2.9.2
• https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field
• https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field