EUVD-2026-23108
GHSA-c276-fj82-f2pq
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Network attack with no privileges or user interaction, disclosing only distinct field values without integrity or availability impact.
Primary rating from GitHub Advisory.
CVSS VectorGitHub Advisory
Lifecycle Timeline
6DescriptionGitHub Advisory
ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain an authorization bypass vulnerability in the choices and counts query parameters of the REST API, where these query builders execute MongoDB distinct() operations that bypass the publicApiProjection restrictions intended to limit which fields are exposed publicly. The choices and counts parameters are processed via applyBuildersSafely before the projection is applied, and MongoDB's distinct operation does not respect projections, returning all distinct values directly. The results are returned in the API response without any filtering against publicApiProjection or removeForbiddenFields. An unauthenticated attacker can extract all distinct field values for any schema field type that has a registered query builder, including string, integer, float, select, boolean, date, slug, and relationship fields. Fields protected with viewPermission are similarly exposed, and the counts variant additionally reveals how many documents have each distinct value. Both the piece-type and page REST APIs are affected. This issue has been fixed in version 4.29.0.
AnalysisAI
Information disclosure in ApostropheCMS 4.28.0 and earlier allows unauthenticated attackers to extract distinct field values via the choices and counts REST API query parameters, bypassing publicApiProjection restrictions. The vulnerability exposes sensitive schema field values, including those protected by viewPermission, and a proof-of-concept exploit exists, though no active exploitation is confirmed.
Technical ContextAI
ApostropheCMS is a Node.js CMS using MongoDB as its data store. The vulnerability arises from MongoDB's distinct() operation, which returns all distinct values for a specified field and ignores any projections set on the query. The application applies builders for choices and counts parameters before the publicApiProjection is enforced, and the distinct results are returned unfiltered, leading to CWE-200 information exposure. The affected CPE is cpe:2.3:a:apostrophecms:apostrophecms:*:*:*:*:*:*:*:*.
RemediationAI
Upgrade to ApostropheCMS 4.29.0 or later, which adds projection and permission checks to the choices and counts query builders. The patch is available at https://github.com/apostrophecms/apostrophe/commit/6c2b548dec2e3f7a82e8e16736603f4cd17525aa. No practical workarounds exist for public APIs; if immediate upgrade is not possible, consider temporarily disabling public REST API access by avoiding publicApiProjection configuration or restricting network access to the API endpoint, though this will remove intended public functionality.
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
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