# CVE-2026-66748: Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field

> Authenticated attackers with custom field permissions can execute arbitrary Ruby code via malicious expressions in select_eval fields, leading to server compromise.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Jul 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-7xm9-634w-f5r7

## What is CVE-2026-66748?

CVE-2026-66748 is a high-severity code injection vulnerability in owen2345 camaleon-cms, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### 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.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-66748?


## How do I fix CVE-2026-66748?

No fix has been published for CVE-2026-66748 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-66748 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66748 exists.

Public exploit code:

- Security Advisory: Camaleon CMS - Authenticated RCE via `select_eval` Custom Field (github_poc): https://github.com/theopaid/CVE-2026-66748-Camaleon-CMS---Authenticated-RCE-via-select_eval-Custom-Field

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-66748 and fix it if it is affected.

What it is: CVE-2026-66748 is a high-severity code injection vulnerability in owen2345 camaleon-cms, published on 28 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-66748 exists.

Affected product: owen2345 camaleon-cms. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-66748/ (Markdown: https://insights.sbomify.com/CVE-2026-66748/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-66748
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-66748
- OSV: https://osv.dev/vulnerability/CVE-2026-66748

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-66748/
Summaries are generated and may contain mistakes; the official description above is the record.