CVE-2026-57579
Alchemy: Unauthenticated nested page API leaks restricted & unpublished content
- State
- Published
- Severity
- 7.5 High
- Published
- Sep 14, 2026
- Updated
- Sep 14, 2026
- Reserved
- Jun 24, 2026
Description
Alchemy is an open source content management system engine written in Ruby on Rails. Prior to 7.4.15, 8.0.15, 8.1.14, and 8.2.6, the unauthenticated GET /api/pages/nested endpoint implemented by Api::PagesController#nested in app/controllers/alchemy/api/pages_controller.rb returns an unfiltered page tree because it performs no authorization and does not scope descendants by the caller's ability. Anonymous callers can retrieve restricted and unpublished page metadata that the sibling show action denies. When elements=true is supplied, PageTreeSerializer also returns element and ingredient content from restricted pages because PageTreePreloader and the serializer do not apply an ability check to those records. This issue is fixed in versions 7.4.15, 8.0.15, 8.1.14, and 8.2.6.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | GitHub_M |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
alchemy_cmsAlchemyCMS |
|
References
- https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-mqq5-j7w8-2hgh
- https://github.com/AlchemyCMS/alchemy_cms/pull/3982
- https://github.com/AlchemyCMS/alchemy_cms/commit/30888fb41d8b71fdfb3b116a7efccd851d73e1f3
- https://github.com/AlchemyCMS/alchemy_cms/commit/5620e76f0d274d6f69f34281b7e46d01879f6b99
- https://github.com/AlchemyCMS/alchemy_cms/commit/8417a2e9dcb00653c8b238f8a040b09532dd4c0f
- https://github.com/AlchemyCMS/alchemy_cms/commit/85702d9fe4e247649b1358900c5af853e83b4a3a
- https://github.com/AlchemyCMS/alchemy_cms/commit/a082dd0afe188d199f386a5e1db01987d0de807f
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.15
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.15
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.1.14
- https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.2.6
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