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.
Parse Server: LiveQuery bypasses CLP pointer permission enforcement
Problem type
Affected products
parse-community
< 8.6.53 - AFFECTED
>= 9.0.0, < 9.6.0-alpha.42 - AFFECTED
References
https://github.com/parse-community/parse-server/security/advisories/GHSA-fph2-r4qg-9576
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/commit/6c3317aca6eb618ac48f999021ae3ef7766ad1ea
https://github.com/parse-community/parse-server/commit/976dad109f3fe3fbd0a3a35ef62e7a5d35eb0bee
GitHub Security Advisories
GHSA-fph2-r4qg-9576
Parse Server's LiveQuery bypasses CLP pointer permission enforcement
https://github.com/advisories/GHSA-fph2-r4qg-9576Impact
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.
Patches
The LiveQuery server now enforces pointer permissions on each event. After the existing check passes (which defers pointer permissions by design), the fix checks whether any configured pointer field on the object points to the subscribing user. Events for objects that don't match are silently skipped, consistent with how ACL mismatches are handled.
Workarounds
Use ACLs on individual objects to restrict read access instead of relying solely on CLP pointer permissions. ACLs are enforced by LiveQuery.
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-33421Click to expand
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"dateUpdated": "2026-03-24T18:14:30.444Z",
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