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Vulnerability record · CVE-2026-66748 · published 28 July 2026

CVE-2026-66748: Code injection vulnerability

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.

8.7 CVSS 4.0 High EPSS 1.1% · top 34.8% CWE-94 · Code injection Deferred
8.7CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
8References
31 Jul 2026Last modified by NVD

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: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:

References

LinkTags
https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/
https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5f
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-Custom-Field
https://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/
https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field
https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field

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Source: NIST National Vulnerability Database (record CVE-2026-66748), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.