CVE-2026-39857

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.

• CWE-200

• https://github.com/apostrophecms/apostrophe/commit/6c2b548dec2e3f7a82e8e16736603f4cd17525aaPatch
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-c276-fj82-f2pqExploit, Mitigation, Vendor Advisory
• https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-c276-fj82-f2pqExploit, Mitigation, Vendor Advisory

Published

Apr 15, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-39850Yii 2 is a PHP application framework. Versions 2.0.54 and pr…7.4
• CVE-2026-39851Saleor is an e-commerce platform. From 2.10.0 to before 3.23…4.3
• CVE-2026-39852Quarkus is a Java framework for building cloud-native applic…8.2
• CVE-2026-39853osslsigncode is a tool that implements Authenticode signing …7.8
• CVE-2026-39855osslsigncode is a tool that implements Authenticode signing …5.5
• CVE-2026-39856osslsigncode is a tool that implements Authenticode signing …5.5
• CVE-2026-39858Traefik is an HTTP reverse proxy and load balancer. Prior to…10
• CVE-2026-39859LiquidJS is a Shopify / GitHub Pages compatible template eng…7.5
• CVE-2026-3986The Calculated Fields Form plugin for WordPress is vulnerabl…6.4
• CVE-2026-39860Nix is a package manager for Linux and other Unix systems. A…8.4
• CVE-2026-39861Claude Code is an agentic coding tool. Prior to version 2.1.…10
• CVE-2026-39862Tophat is a mobile applications testing harness. Prior to 2.…8.8