CVE-2026-33421 Parse Server: LiveQuery bypasses CLP pointer permission enforcement
Authenticated users can bypass pointer-based access controls in LiveQuery to read unauthorized sensitive data from protected classes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33421?
CVE-2026-33421 is a high-severity missing authorization vulnerability in Parseplatform Parse-Server, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-33421?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.53 |
parse-server npm | All versions | 8.6.53 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.42 |
parse-server npm | From 9.0.0 | 9.6.0-alpha.42 |
parse Bitnami | All versions | 8.6.53, 9.6.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-33421?
Upgrade parse-server to a fixed version for your release line: 8.6.53 or 9.6.0-alpha.42.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-33421 being exploited?
There is no known exploitation of CVE-2026-33421 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-33421, GHSA-fph2-r4qg-9576.