CVE-2026-57579
Alchemy: Unauthenticated nested page API leaks restricted & unpublished content
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 Anonymous callers can retrieve restricted and unpublished page metadata that the sibling show action denies.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.
INFO
Published Date :
Sept. 14, 2026, 5:17 p.m.
Last Modified :
Sept. 30, 2026, 7:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Alchemy CMS to version 7.4.15 or later.
- Update Alchemy CMS to version 8.0.15 or later.
- Update Alchemy CMS to version 8.1.14 or later.
- Update Alchemy CMS to version 8.2.6 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-57579.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-57579 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-57579
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2026-57579 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-57579 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-mqq5-j7w8-2hgh Added SSVC {'id': 'CVE-2026-57579', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-14T17:39:44.487415Z'} -
New CVE Received by [email protected]
Sep. 14, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-862 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/57xxx/CVE-2026-57579.json">CVE-2026-57579</a> Added Reference https://github.com/AlchemyCMS/alchemy_cms/commit/30888fb41d8b71fdfb3b116a7efccd851d73e1f3 Added Reference https://github.com/AlchemyCMS/alchemy_cms/commit/5620e76f0d274d6f69f34281b7e46d01879f6b99 Added Reference https://github.com/AlchemyCMS/alchemy_cms/commit/8417a2e9dcb00653c8b238f8a040b09532dd4c0f Added Reference https://github.com/AlchemyCMS/alchemy_cms/commit/85702d9fe4e247649b1358900c5af853e83b4a3a Added Reference https://github.com/AlchemyCMS/alchemy_cms/commit/a082dd0afe188d199f386a5e1db01987d0de807f Added Reference https://github.com/AlchemyCMS/alchemy_cms/pull/3982 Added Reference https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v7.4.15 Added Reference https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.0.15 Added Reference https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.1.14 Added Reference https://github.com/AlchemyCMS/alchemy_cms/releases/tag/v8.2.6 Added Reference https://github.com/AlchemyCMS/alchemy_cms/security/advisories/GHSA-mqq5-j7w8-2hgh