Vulnerability · Published Jul 28, 2026 · Assigned by VulnCheck
CVE-2026-66748Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field
High 8.8
In plain English
A high-severity code injection in camaleon-cms from owen2345. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 67% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| owen2345 | camaleon-cms | 2.1.1 – through 2.9.12.9.2 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- Researcher Blog (Theodosis Paidakis) technical-description, exploit
- Researcher Blog (Enrik Mustafa) technical-description, exploit
- Researcher Disclosure (Theodosis Paidakis) exploit, technical-description
- Release Notes release-notes
- Pull Request issue-tracking
- Patch Commit patch
- https://www.vulncheck.com/advisories/camaleon-cms-authenticated-rce-via-select-eval-custom-field third-party-advisory