CVE-2026-33421

Description

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.

PUBLISHED Reserved 2026-03-19 | Published 2026-03-24 | Updated 2026-03-24 | Assigner GitHub_M

Problem types

CWE-863: Incorrect Authorization

Product status

References

github.com/...server/security/advisories/GHSA-fph2-r4qg-9576

github.com/parse-community/parse-server/pull/10250

github.com/parse-community/parse-server/pull/10252

github.com/...ommit/6c3317aca6eb618ac48f999021ae3ef7766ad1ea

github.com/...ommit/976dad109f3fe3fbd0a3a35ef62e7a5d35eb0bee

cve.org (CVE-2026-33421)

nvd.nist.gov (CVE-2026-33421)

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