CVE-2026-30947: Parse Server LiveQuery Class-Level Permissions Bypass
Summary
CVE-2026-30947: Parse Server has a bypass of class-level permissions in LiveQuery. Affects parse-server across 2 version ranges.
< 8.6.16
>= 9.0.0, < 9.5.2-alpha.3
Fixed in 8.6.16 or 9.5.2-alpha.3, depending on the release line you run. How to fix ↓
Also tracked for
- parse · Bitnami
The same CVE-2026-30947 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
Parse Server is an open-source backend framework that enables developers to build applications with a robust server-side infrastructure. It provides features such as data storage, user authentication, and real-time notifications through LiveQuery. However, a critical vulnerability has been identified in its LiveQuery functionality, which allows unauthorized access to data intended to be restricted by class-level permissions (CLP).
Vulnerability Detail
The vulnerability arises from the failure to enforce class-level permissions for LiveQuery subscriptions. This means that an unauthenticated or unauthorized client can subscribe to any class that has LiveQuery enabled, thereby receiving real-time updates for all objects within that class, regardless of the permissions set. This can lead to sensitive data being exposed to unauthorized users, posing a significant security risk.
How To Fix
Latest published version: 9.10.5 as of 22 Oct 2026
npm install parse-server@9.10.5Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 8.6.168.6.16npm install parse-server@8.6.16 -
>= 9.0.0, < 9.5.2-alpha.39.5.2-alpha.3npm install parse-server@9.5.2-alpha.3
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Workaround
As a temporary workaround, you can disable LiveQuery for classes that use class-level permissions by removing them from the liveQuery.classNames server configuration. This can be done by modifying the server configuration file as follows:
{
"liveQuery": {
"classNames": []
}
}
Conclusion
The Parse Server vulnerability CVE-2026-30947 highlights a significant security risk due to the bypass of class-level permissions in LiveQuery. It is crucial for developers using Parse Server to update to the patched versions or implement workarounds to protect sensitive data from unauthorized access.
See every vulnerability recorded for parse-server →
FAQ
The vulnerability allows unauthorized users to access real-time updates for data that should be restricted, leading to potential data leaks.
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All Parse Server deployments using LiveQuery with class-level permissions are affected, specifically versions prior to 9.5.2-alpha.3 and 8.6.16.
If immediate updates are not possible, disable LiveQuery for classes that use class-level permissions as a temporary workaround.
The CVSS score for this vulnerability is 8.7, indicating a high severity level.
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