CVE-2026-66748: high-severity vulnerability in owen2345 camaleon-cms
Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.7epss 1.1%
from disclosure to weaponsame day
Published on NVDJul 28
1st PoCJul 24
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★ 1cve_referencegithub.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Fieldunverifiedcve_referencetpaidakis.com/writeups/camaleon-cms-rce-select-eval/unverifiedcve_referenceenrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — owen2345 camaleon-cms
In the same product, most dangerous first.
CVE-2024-46986CRITICALArbitrary file write leading to RCE in Camaleon CMSEPSS 37.1%CVE-2024-46987HIGHArbitrary path traversal in Camaleon CMSEPSS 14.6%CVE-2025-2304CRITICALCamaleon CMS Privilege EscalationEPSS 0.6%CVE-2026-67616MEDIUMCamaleon CMS 2.9.2 Missing Authorization via /admin/post_type drafts endpointEPSS 0.4%CVE-2026-116009HIGHCamaleon CMS before 2.9.3 Path Traversal RCE via Media crop_url ActionEPSS 0.4%
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