CVE-2026-23885
MEDIUM
GHSA-2762-657x-v979
CVSS Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
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()`.
Analysis
Arbitrary code execution in Alchemy CMS before versions 7.4.12 and 8.0.3 stems from unsafe use of Ruby's eval() function on the resource_handler.engine_name parameter in the ResourcesHelper class. An authenticated administrator can manipulate module configurations to inject and execute arbitrary system commands with the privileges of the Ruby process. …
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Remediation
Within 30 days: Identify affected systems running Ruby on Rails. and apply vendor patches as part of regular patch cycle. …
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