RCE in Owen2345 Camaleon-Cms
CVE-2026-66748
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.
Vulnerability class: RCE (Remote Code Execution)
EPSS: 0.008 (55.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Owen2345 Camaleon-cms — versions 2.1.1, 2.9.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- Researcher Disclosure (Theodosis Paidakis) (technical-description, exploit)
- Release Notes (release-notes)
- Pull Request (issue-tracking)
- Patch Commit (patch)
- disclosure@vulncheck.com (third-party-advisory)
- Researcher Blog (Theodosis Paidakis) (technical-description, exploit)
- Researcher Blog (Enrik Mustafa) (technical-description, exploit)
Frequently asked questions
- What is CVE-2026-66748?
- CVE-2026-66748 is a high-severity vulnerability in Owen2345 Camaleon-Cms, classified under Code Injection. CVSS score: 8.8/10. Published 2026-07-28.
- How severe is CVE-2026-66748?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-66748 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.