app/controllers/alchemy/api/pages_controller.rb:28 (Api::PagesController#nested)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endpoint returns the full page tree to any anonymous caller, including restricted (member-only) pages and unpublished/draft pages that should be hidden.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.
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.
An unauthenticated GET /api/pages/nested returns HTTP 200 with the restricted page ("restricted":true) and an unpublished draft ("public":false); ?elements=true leaks its content (e.g. TOPSECRET_RESTRICTED_BODY_proof123).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.
# 1) Metadata leak (guest, no auth)
curl -s http://localhost:3000/api/pages/nested | python3 -m json.tool | grep -E '"name"|"restricted"|"public"'
# 2) Content leak of restricted page
curl -s "http://localhost:3000/api/pages/nested?elements=true" | grep -oE 'TOPSECRET_RESTRICTED_BODY_[A-Za-z0-9]+|RESTRICTED_RICHTEXT_[A-Za-z0-9]+'
# 3) Contrast — show denies the same guest
curl -s -o /dev/null -w "show /api/pages/3 -> HTTP %{http_code}\n" http://localhost:3000/api/pages/3
def nested
@page = Page.find_by(id: params[:page_id]) || Language.current_root_page
authorize! :show, @page
preloaded_page = PageTreePreloader.new(page: @page, user: current_alchemy_user, ability: current_ability).call
render json: PageTreeSerializer.new(preloaded_page, ability: current_ability,
user: current_alchemy_user, elements: params[:elements])
end
Additionally scope PageTreePreloader's self_and_descendants via accessible_by(current_ability) and gate element emission in PageTreeSerializer#page_elements behind opts[:ability].can?(:show, page).
| Software | Affected versions |
|---|---|
alchemy_cms
|
>= 8.2.0, < 8.2.6 |
alchemy_cms
|
>= 8.1.0, < 8.1.14 |
alchemy_cms
|
>= 8.0.0.a, < 8.0.15 |
alchemy_cms
|
< 7.4.15 |
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