Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.7epss 0.8%
from disclosure to weapon0 days
Published on NVDJul 28
1st PoCJul 24
exploitation probability
0.8%top 47% of all CVEs
observed exploitation
nono source reports it
4 public exploit(s)
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:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
owen2345 · camaleon-cmspublic PoCs found — 4
githubgithub.com/theopaid/CVE-2026-66748-Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field★ 0cve_referenceenrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/unverifiedcve_referencegithub.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Fieldunverifiedcve_referencetpaidakis.com/writeups/camaleon-cms-rce-select-eval/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5fhttps://github.com/owen2345/camaleon-cms/pull/1136https://github.com/owen2345/camaleon-cms/releases/tag/2.9.2https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Fieldhttps://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field