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CVE-2026-66748 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field	CISA-ADP	ExploitTechnical Analysis
https://enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/	[email protected]
https://github.com/owen2345/camaleon-cms/commit/158823668e2e5c3114a69b34cf1c96cb41533c5f	[email protected]	Source CodeVendor
https://github.com/owen2345/camaleon-cms/pull/1136	[email protected]	Issue TrackingVendor
https://github.com/owen2345/camaleon-cms/releases/tag/2.9.2	[email protected]	Release NotesVendor
https://github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field	[email protected]	ExploitTechnical Analysis
https://tpaidakis.com/writeups/camaleon-cms-rce-select-eval/	[email protected]
https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field	[email protected]	AdvisoryBundleRemedy

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-94	Improper Control of Generation of Code ('Code Injection')	[email protected]

Affected Products

Product	Versions
Camaleon CMS	>= 2.1.1, <= 2.9.1 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 2.9.2moderate efforthttps://github.com/owen2345/camaleon-cms/releases/tag/2.9.2 Existing installs upgrading to 2.9.2 should review the migration guide. Workaround:low effort Revoke the 'custom_fields' manage permission for all users except administrators.

Change History

4 change records found show changes

Date	Action	Recorded By
Jul 31, 2026	CVE Modified	[email protected]
Jul 29, 2026	CVE Modified	[email protected]
Jul 28, 2026	CVE Modified	CISA-ADP
Jul 28, 2026	New CVE Received	[email protected]