CVE-2026-30947

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.2 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 and 8.6.16.

How to fix CVE-2026-30947

To remediate CVE-2026-30947, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.16 or later
• —upgrade to 9.5.2-alpha.3 or later

Is CVE-2026-30947 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.16, >= 9.0.0, < 9.5.2
• >= 9.0.0, < 9.5.2-alpha.3

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30947
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.16
• WEBgithub.com/parse-community/parse-server/releases/tag/9.5.2-alpha.3