PatchTheCVECVE-2026-66748: Camaleon CMS versions 2.1.1 through 2.9.1 contains an authenticated remote code execution vulnerability that a
CVE-2026-66748 is a high-severity flaw (CVSS 8.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- High severity
- CISA SSVC: public proof of concept
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 34%) |
| CISA exploited list | No |
| Weakness | CWE-94 |
| Published | 2026-07-28 |
| Last modified | 2026-10-24 |
Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: theopaid/CVE-2026-66748-Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field (1 stars)
- Write-up: enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/
- Write-up: github.com/theopaid/Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field
- Write-up: tpaidakis.com/writeups/camaleon-cms-rce-select-eval/
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-66748?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-66748 being exploited?
CVE-2026-66748 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-66748 affect?
CVE-2026-66748 affects affected software. Severity is high (CVSS 8.8). 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 se
How urgent is CVE-2026-66748?
Priority 50/100. High severity; CISA SSVC: public proof of concept