CVE-2026-30947: Parse Server ha a bypass of class-level permissions in LiveQuery
Impact
Class-level permissions (CLP) are not enforced for LiveQuery subscriptions. An unauthenticated or unauthorized client can subscribe to any LiveQuery-enabled class and receive real-time events for all objects, regardless of CLP restrictions.
All Parse Server deployments that use LiveQuery with class-level permissions are affected. Data intended to be restricted by CLP is leaked to unauthorized subscribers in real time.
Patches
The fix enforces CLP before creating the subscription and during event delivery.
Workarounds
Disable LiveQuery for classes that use CLP restrictions by removing them from the liveQuery.classNames server configuration.
References
- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-7ch5-98q2-7289 - Fix Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.2-alpha.3 - Fix Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.16
Other sources
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2-alpha.3 and 8.6.16, class-level permissions (CLP) are not enforced for LiveQuery subscriptions. An unauthenticated or unauthorized client can subscribe to any LiveQuery-enabled class and receive real-time events for all objects, regardless of CLP restrictions. All Parse Server deployments that use LiveQuery with class-level permissions are affected. Data intended to be restricted by CLP is leaked to unauthorized subscribers in real time. This vulnerability is fixed in 9.5.2-alpha.3 and 8.6.16.
— MITRE
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-30947?
CVE-2026-30947 is a high severity vulnerability due to the bypass of class-level permissions in LiveQuery allowing access to unauthorized data.
How do I fix CVE-2026-30947?
To fix CVE-2026-30947, upgrade Parse Server to version 9.5.2-alpha.3 or later, or version 8.6.16 or later.
What are the affected versions for CVE-2026-30947?
CVE-2026-30947 affects Parse Server versions prior to 9.5.2-alpha.3 and 8.6.16.
Who can exploit CVE-2026-30947?
CVE-2026-30947 can be exploited by unauthenticated users who can access LiveQuery subscriptions.
What impact does CVE-2026-30947 have on data security?
CVE-2026-30947 can lead to unauthorized access to sensitive data due to insufficient enforcement of permissions.