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CVE-2026-57579

Alchemy: Unauthenticated nested page API leaks restricted & unpublished content

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-57579

Published

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 Anonymous callers can retrieve restricted and unpublished page metadata that the sibling show action denies.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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-57579

Published

alchemy_cms

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "AlchemyCMS",
                    "product": "alchemy_cms",
                    "versions": [
                        {
                            "version": "< 7.4.15",
                            "status": "affected"
                        },
                        {
                            "version": ">= 8.0.0, < 8.0.15",
                            "status": "affected"
                        },
                        {
                            "version": ">= 8.1.0, < 8.1.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 8.2.0, < 8.2.6",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON