AlchemyCMS has Authenticated Remote Code Execution (RCE) via eval injection in ResourcesHelper

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Summary

CVECVE-2026-23885
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-19 22:16:02 UTC
Updated2026-04-09 14:54:27 UTC
DescriptionAlchemy 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()`.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-95 | CWE-95 CWE-95: Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Alchemy-cms Alchemy Cms All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA AlchemyCMS Alchemy Cms affected < 7.4.12 Not specified
CNA AlchemyCMS Alchemy Cms affected >= 8.0.0.a, < 8.0.3 Not specified

References

ReferenceSourceLinkTags
github.com/AlchemyCMS/alchemy_cms/commit/55d03ec600fd9e07faae1138b923790... [email protected] github.com Patch
github.com/AlchemyCMS/alchemy_cms/commit/563c4ce45bf5813b7823bf3403ca1fc... [email protected] github.com Patch
github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.12 [email protected] github.com Release Notes
github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-2762-657x-v979 [email protected] github.com Vendor Advisory
github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.3 [email protected] github.com Release Notes
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