Detections
Analytics

CVE-2026-66748

high

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://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/

https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field

https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/

https://github.com/theopaid/CVE-2026-66748-Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field

https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field

https://github.com/owen2345/camaleon-cms/releases/tag/2.9.2

https://github.com/owen2345/camaleon-cms/pull/1136

https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5f

Details

Source: Mitre, NVD

Published: 2026-07-28

Updated: 2026-07-31

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High

EPSS

EPSS: 0.00739