https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-05T16:54:43.336859+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/fkie_cve-2026-57579 fkie_cve-2026-57579 2026-10-05T16:54:43.355635+00:00

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 Anonymous callers can retrieve restricted and unpublished page metadata that the sibling show action denies.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

 https://vulnerability.circl.lu/vuln/ghsa-mqq5-j7w8-2hgh GHSA-mqq5-j7w8-2hgh — AlchemyCMS: Unauthenticated nested page API leaks restricted & unpublished content 2026-10-05T16:54:43.355747+00:00

Affected: RubyGems: alchemy_cms

# Unauthenticated nested page API leaks restricted & unpublished content

- **Location:** `app/controllers/alchemy/api/pages_controller.rb:28` (`Api::PagesController#nested`) - **Affected version:** Alchemy CMS 8.3.0.dev (Rails 8.1.3)

## Description

The unauthenticated `GET /api/pages/nested` endpoint returns the full page tree to any anonymous caller, including restricted (member-only) pages and unpublished/draft pages that should be hidden. Appending `?elements=true` additionally dumps the element/ingredient **content** of restricted pages, fully bypassing the access control the sibling `show` and `index` actions enforce.

## Root cause

`Api::PagesController#nested` calls no `authorize!` and applies no `published`/`restricted` scoping, unlike `show` (`authorize! :show`) and `index` (`accessible_by(current_ability, :index)`). `PageTreePreloader` loads `page.self_and_descendants` unfiltered, and `PageTreeSerializer` emits every page's metadata (and, with `elements`, `public_version.elements`) with no ability check.

## Evidence

An unauthenticated `GET /api/pages/nested` returns HTTP 200 with the restricted page (`"restricted":true`) and an unpublished draft (`"public":false`); `?elements=true` leaks its content (e.g. `TOPSECRET_RESTRICTED_BODY_proof123`). The same guest hitting `GET /api/pages/3` (`show`) gets HTTP **403** `{"error":"Not authorized"}`, proving `nested` returns what `show` correctly denies.

### Reproduction

```bash # 1) Metadata leak (guest, no auth) cu…