CVE-2026-66748
Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
HIGH 8.7EPSS 1.1%
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.
- Affected
- owen2345 · camaleon-cms
- CVSS v4.0 VULNCHECK
- 8.7 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 VULNCHECK
- 8.8 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS
- 1.14% chance of exploitation in the next 30 days, 66th percentile
- Published
- 2026-07-28
- Updated
- 2026-08-14
Proof-of-concept exploits (3)
- https://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/
- https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/
- theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field1★ · 2026-07-29