CVE-2026-33163: Parse Server Leaks Protected Fields via LiveQuery afterEvent Trigger
Summary
CVE-2026-33163: Parse Server leaks protected fields via LiveQuery afterEvent trigger. Affects parse-server across 2 version ranges.
< 8.6.50
>= 9.0.0, < 9.6.0-alpha.35
Fixed in 8.6.50 or 9.6.0-alpha.35, depending on the release line you run. How to fix ↓
Also tracked for
- parse · Bitnami
The same CVE-2026-33163 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 platform that enables developers to build applications with a robust cloud infrastructure. It provides features such as data storage, user authentication, and real-time notifications. However, it is susceptible to vulnerabilities that can compromise sensitive user data, particularly when using LiveQuery functionalities.
Vulnerability Detail
The vulnerability arises from a reference detachment bug when a 'Parse.Cloud.afterLiveQueryEvent' trigger is registered for a class. This bug causes the LiveQuery server to leak protected fields and 'authData' to all subscribers of that class. Fields marked as protected via Class-Level Permissions are included in LiveQuery event payloads for all event types, allowing unauthorized users to access sensitive personal information and OAuth tokens from third-party authentication providers.
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.
-
< 8.6.508.6.50npm install parse-server@8.6.50 -
>= 9.0.0, < 9.6.0-alpha.359.6.0-alpha.35npm install parse-server@9.6.0-alpha.35
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
As a temporary workaround, remove all 'Parse.Cloud.afterLiveQueryEvent' trigger registrations. This will prevent the reference detachment from occurring, ensuring that protected fields are correctly filtered.
Conclusion
The CVE-2026-33163 vulnerability in Parse Server poses a significant risk by leaking protected fields to unauthorized users. It is crucial to update to the patched versions or implement the suggested workaround to safeguard sensitive information.
See every vulnerability recorded for parse-server →
FAQ
The vulnerability allows unauthorized users to access sensitive data, including personal information and OAuth tokens, from other users.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Versions 9.0.0 to 9.6.0-alpha.34 and all versions below 8.6.50 are affected by this vulnerability.
The CVSS score of this vulnerability is 8.2, indicating a high severity level.
If you cannot update the package right away, consider removing all 'Parse.Cloud.afterLiveQueryEvent' trigger registrations as a temporary workaround.
References
Related vulnerabilities
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