CVE-2026-66748
HighCVSS 8.8Exploitation Probability (EPSS)
Elevated risk53th percentile - higher than 53% of all known CVEs
Summary
A vulnerability in Camaleon CMS allows an authenticated user with custom field management permissions to execute arbitrary Ruby code. A malicious expression in the select_eval field is evaluated via instance_eval when rendering the post edit page.
Risk Assessment
An attacker can take over the web server and gain access to all data and execute arbitrary commands.
Recommendation
Update Camaleon CMS to a version later than 2.9.1.
Other vulnerabilities in Camaleon CMS
See all- CVE-2026-67616Medium
Camaleon CMS up to version 2.9.2 (fixed in commit 88ab703) contains a missing authorization vulnerability on the drafts endpoint. Any authenticated low-privileged user can create draft posts by bypassing role and permission checks, sending requests to the drafts endpoint using only session authentication.
- CVE-2026-10715Medium
Camaleon CMS 2.9.2 contains an improper authorization vulnerability in the administrator draft autosave endpoint. A low-privileged authenticated user can send an arbitrary post_id to POST /admin/post_type/<POST_TYPE_ID>/drafts and overwrite the draft associated with another user's post.
- CVE-2026-1776Medium
A path traversal vulnerability in Camaleon CMS versions 2.4.5.0 through 2.9.0 (prior to commit f54a77e) in the AWS S3 uploader implementation. Authenticated users can read arbitrary files from the web server's filesystem by manipulating the 'file' parameter in the download_private_file function.
Original NVD description (English source)
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.