---
id: CVE-2026-109303
title: >-
  Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce
  identity-scoped protectedFields (authenticated, role, or per-user groups) on
  count queries using the $relatedTo operator, exposing the size of protected
  Relatio…
summary: >-
  Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce
  identity-scoped protectedFields (authenticated, role, or per-user groups) on
  count queries using the $relatedTo operator, exposing the size of protected
  Relatio…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-639
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T17:17:24.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109303'
references:
  - url: >-
      https://github.com/parse-community/parse-server/security/advisories/GHSA-rmhf-xv62-rm99
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/parse-server-before-8.6.93-and-9.0.0-before-9.10.1-alpha.13-protectedfields-bypass-via-relation-count-query
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-12T18:00:08.195Z'
---

## Overview

Parse Server before 8.6.93 and 9.0.0 before 9.10.1-alpha.13 does not enforce identity-scoped protectedFields (authenticated, role, or per-user groups) on count queries using the $relatedTo operator, exposing the size of protected Relation fields. An authenticated user who can read the owning object can combine counts with an objectId constraint as a membership oracle to reveal confidential memberships such as private groups or block lists.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.