Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apostrophecms | Apostrophecms | < 4.29.0 |
Related Weaknesses (CWE)
References
- https://github.com/apostrophecms/apostrophe/commit/00d472804bb622df36a761b6f2cf2Patch
- https://github.com/apostrophecms/apostrophe/commit/6c2b548dec2e3f7a82e8e16736603Patch
- https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-xhq9-58fw-8ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-33888?
CVE-2026-33888 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 m...
How severe is CVE-2026-33888?
CVE-2026-33888 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33888?
Check the references section above for vendor advisories and patch information. Affected products include: Apostrophecms Apostrophecms.