CVE-2026-33421

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.53 and 9.6.0-alpha.42, Parse Server's LiveQuery WebSocket interface does not enforce Class-Level Permission (CLP) pointer permissions (readUserFields and pointerFields). Any authenticated user can subscribe to LiveQuery events and receive real-time updates for all objects in classes protected by pointer permissions, regardless of whether the pointer fields on those objects point to the subscribing user. This bypasses the intended read access control, allowing unauthorized access to potentially sensitive data that is correctly restricted via the REST API. This issue has been patched in versions 8.6.53 and 9.6.0-alpha.42.

The following products are affected by CVE-2026-33421 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-33421.

URL	Resource
https://github.com/parse-community/parse-server/commit/6c3317aca6eb618ac48f999021ae3ef7766ad1ea
https://github.com/parse-community/parse-server/commit/976dad109f3fe3fbd0a3a35ef62e7a5d35eb0bee
https://github.com/parse-community/parse-server/pull/10250
https://github.com/parse-community/parse-server/pull/10252
https://github.com/parse-community/parse-server/security/advisories/GHSA-fph2-r4qg-9576