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High · 8.8 Public exploit CVE-2026-66748 EUVD-2026-49871GHSA-7xm9-634w-f5r7

Camaleon CMS 2.1.1 - 2.9.1 Authenticated RCE via select_eval Custom Field

Published Jul 28, 2026 · Updated Nov 8, 2026 · Assigned by VulnCheck

Vendor: owen2345 Product: Camaleon CMS

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

VendorProductAffectedFixed
owen2345 camaleon-cms 2.1.1 – ≤ 2.9.1, 2.9.2 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References