CVE-2026-100632: Parse Server 9.0.0 before 9.10.1 Protected Fields Disclosure via LiveQuery

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-26 · updated 2026-09-30
Weakness: CWE-200

Description

Parse Server is an open-source backend server. In versions >= 9.0.0 and < 9.10.1-alpha.8, and in versions < 8.6.89, LiveQuery evaluates the protectedFields class-level permission against an incompletely resolved caller identity: the subscriber's roles are not resolved, and when a subscription does not supply its own session token the event payload is redacted against an anonymous identity even though the read was authorized against the connected user. As a result, field masks defined for a role, for authenticated users, or for a specific user are not applied, so an authenticated subscriber can receive field values that the REST API correctly withholds and can use a masked field to filter or watch a subscription. Only classes with LiveQuery enabled that define protectedFields under a role:, authenticated, or per-user group are affected; masks under the public (*) group are applied correctly. The issue is fixed in 9.10.1-alpha.8 and 8.6.89. As a workaround, additionally define the affected field masks under the public (*) group, or disable LiveQuery for classes whose class-level permissions rely on role-scoped, authenticated, or per-user protectedFields groups.

Affected products

parse-community parse-server: from 9.0.0 before 9.10.1-alpha.8; before 8.6.89 — fixed in 8.6.89, 9.10.1-alpha.8

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.89, 9.10.1-alpha.8. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-100632 or the next vulnerability affects your stack