Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/
- https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb
- 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-Cus
- https://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/
- https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-e
- https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Cus
FAQ
What is CVE-2026-66748?
CVE-2026-66748 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 supplyi...
How severe is CVE-2026-66748?
CVE-2026-66748 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66748?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.