CVE-2026-33888

The record

ApostropheCMS is an open-source Node.js content management system. Versions 4.28.0 and prior contain an authorization bypass vulnerability in the getRestQuery method of the @apostrophecms/piece-type module, where the method checks whether a MongoDB projection has already been set before applying the admin-configured publicApiProjection. An unauthenticated attacker can supply a project query parameter in the REST API request, which is processed by applyBuildersSafely before the permission check, pre-populating the projection state and causing the publicApiProjection to be skipped entirely. This allows disclosure of any field on publicly queryable documents that the administrator explicitly restricted from the public API, such as internal notes, draft content, or metadata. Exploitation is trivial, requiring only appending query parameters to a public URL with no authentication. This issue has been fixed in version 4.29.0.

Affected packages

Related vulnerabilities

• GHSA-xhq9-58fw-859p ApostropheCMS: publicApiProjection Bypass via project Query Builder in Piece-Type REST API Same vulnerability
• CVE-2026-45013 ApostropheCMS is an open-source Node.js content management system. Also affects apostrophe
• CVE-2026-45012 ApostropheCMS is an open-source Node.js content management system. Also affects apostrophe
• CVE-2026-45011 ApostropheCMS is an open-source Node.js content management system. Also affects apostrophe
• GHSA-5f64-7vfc-rcx6 Apostrophe has stored XSS via javascript: URL in Image Widget Link Also affects apostrophe
• GHSA-gf43-24g3-5hw2 Apostrophe has a Weak Password Recovery Mechanism for Forgotten Password and Improper… Also affects apostrophe
• GHSA-pr28-mf3q-qpg6 Apostrophe has authenticated SSRF in rich-text widget import via… Also affects apostrophe
• GHSA-c276-fj82-f2pq ApostropheCMS: Information Disclosure via choices/counts Query Parameters Bypassing… Also affects apostrophe