CVE-2026-33421

moderate-risk

Published 2026-03-24

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.

Do I need to act?

0.01% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.5/10 Medium

NETWORK / LOW complexity

Affected Products (20)

Parse-Server

Affected Vendors

Parseplatform

References (5)

Patch https://github.com/parse-community/parse-server/commit/6c3317aca6eb618ac48f99902...

Patch https://github.com/parse-community/parse-server/commit/976dad109f3fe3fbd0a3a35ef...

Issue Tracking https://github.com/parse-community/parse-server/pull/10250

Issue Tracking https://github.com/parse-community/parse-server/pull/10252

Vendor Advisory https://github.com/parse-community/parse-server/security/advisories/GHSA-fph2-r4...

/ 100

moderate-risk

Severity 24/34 · High

Exploitability 0/34 · Minimal

Exposure 24/34 · High