CVE-2026-30966

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 8.6.20, Parse Server's internal tables, which store Relation field mappings such as role memberships, can be directly accessed via the REST API or GraphQL API by any client using only the application key. No master key is required. An attacker can create, read, update, or delete records in any internal relationship table. Exploiting this allows the attacker to inject themselves into any Parse Role, gaining all permissions associated with that role, including full read, write, and delete access to classes protected by role-based Class-Level Permissions (CLP). Similarly, writing to any such table that backs a Relation field used in a pointerFields CLP bypasses that access control. This vulnerability is fixed in 9.5.2 and 8.6.20.

How to fix CVE-2026-30966

To remediate CVE-2026-30966, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.20 or later
• —upgrade to 9.5.2-alpha.7 or later

Is CVE-2026-30966 being exploited?

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

Affected packages (2)

• from 0, < 8.6.20, >= 9.0.0, < 9.5.2
• >= 9.0.0-alpha.1, < 9.5.2-alpha.7

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30966
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.20
• WEBgithub.com/parse-community/parse-server/releases/tag/9.5.2-alpha.7