RCE in Alchemy-Cms Alchemy Cms
CVE-2026-23885
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()`.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Alchemy-Cms Alchemy Cms
- Alchemycms Alchemy Cms — versions < 7.4.12, >= 8.0.0.a, < 8.0.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-2762-657x-v979 (Vendor Advisory)
- github.com/AlchemyCMS/alchemy_cms/commit/55d03ec600fd9e07faae1138b923790028917d… (Patch)
- github.com/AlchemyCMS/alchemy_cms/commit/563c4ce45bf5813b7823bf3403ca1fc32cb769… (Patch)
- github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.12 (Release Notes)
- github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.3 (Release Notes)
Frequently asked questions
- What is CVE-2026-23885?
- CVE-2026-23885 is a medium-severity vulnerability in Alchemy-Cms Alchemy Cms, classified under Eval Injection. CVSS score: 6.4/10. Published 2026-01-19.
- How severe is CVE-2026-23885?
- Medium severity. CVSS v3 base score is 6.4 out of 10.
- Is CVE-2026-23885 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.