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Vulnerability · Published Jan 19, 2026 · Assigned by GitHub_M

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

Medium 6.4

In plain English

A medium-severity security flaw in alchemy_cms from AlchemyCMS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.5%top 59.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official 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()`.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
RubyGemsalchemy_cms7.4.12GHSA-2762-657x-v979
RubyGemsalchemy_cms8.0.3GHSA-2762-657x-v979

Affected products (as reported)

VendorProductVersions
AlchemyCMS alchemy_cms < 7.4.12>= 8.0.0.a, < 8.0.3

Weakness: CWE-95 · Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

References