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,
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.
- 🔗 tpaidakis.com/writeups/camaleon-cms-rce-select-eval/
- 🔗 enrik-m.github.io/posts/Camaleon-CMS-Vulnerabilties/
- 🔗 github.com/theopaid/Camaleon-CMS---Authenticated-RCE…
- 🔗 github.com/owen2345/camaleon-cms/releases/tag/2.9.2
- 🔗 github.com/owen2345/camaleon-cms/pull/1136
- 🔗 github.com/owen2345/camaleon-cms/commit/158823668e2e…
- 🔗 www.vulncheck.com/advisories/camaleon-cms-authenticated-rce…
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| Tier | 2026-09-23 | 2026-10-07 |
|---|---|---|
| ≥90 % | 491 | 344 |
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| ≥10 % | 0 | 3 |
| <10 % | 0 | 549 |
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,
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
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