6.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-23885

CVE-2026-23885: AlchemyCMS has Authenticated Remote Code Execution (RCE) via eval injection in ResourcesHelper

Alchemy is an open source content management system engine written in Ruby on Rails. Prior to versions 7.4.12 and 8.0.3, the application uses the Ruby eval() function to dynamically execute a string provided by the resource_handler.engine_name attribute in Alchemy::ResourcesHelper#resource_url_proxy. The vulnerability exists in app/helpers/alchemy/resources_helper.rb at line 28. The code explicitly bypasses security linting with # rubocop:disable Security/Eval, indicating that the use of a dangerous function was known but not properly mitigated. Since engine_name is sourced from module definitions that can be influenced by administrative configurations, it allows an authenticated attacker to escape the Ruby sandbox and execute arbitrary system commands on the host OS. Versions 7.4.12 and 8.0.3 fix the issue by replacing eval() with send().

(GitHub Advisory)

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CVE-2026-23885

CVE-2026-23885:

6.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
alchemy_cms	rubygems	< 7.4.12	7.4.12
alchemy_cms	rubygems	>= 8.0.0.a, < 8.0.3	8.0.3

Technical Details

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Root Cause Analysis

The vulnerability is a classic 'eval injection' found in the resource_url_proxy method of the Alchemy::ResourcesHelper module. The analysis of the provided patches (commits 55d03ec600fd9e07faae1138b923790028917d26 and 563c4ce45bf5813b7823bf3403ca1fc32cb769e7) clearly shows the replacement of a dangerous eval call with a safer public_send method. The eval function was being called with resource_handler.engine_name, which is derived from administrative configurations. An authenticated attacker with privileges to modify these configurations could inject malicious Ruby code as a string, which would then be executed by the eval function on the server, resulting in remote code execution. The two commits represent fixes for different version branches (7.4 and 8.0), where the vulnerable helper file was located in different paths (lib/ vs. app/helpers/). The identified function Alchemy::ResourcesHelper.resource_url_proxy is the exact location of the vulnerability and would be the primary indicator in a runtime profile during exploitation.

Vulnerable functions

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WAF Rule

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Reasoning

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