---
id: CVE-2026-116801
title: Parse Server 9.0.0 before 9.10.5-alpha.6 ACL Bypass via $relatedTo Query
summary: >-
  Parse Server before 8.6.105 and 9.0.0 before 9.10.5-alpha.6 does not validate
  the owning object reference in $relatedTo relation queries, so supplying a
  query operator instead of an object ID bypasses the owning-object ACL check. A
  clien…
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'
cvssSource: cna
cwe:
  - CWE-943
vendor: parse-community
product: parse-server
affected:
  - parse-server >= 9.0.0 < 9.10.5-alpha.6
  - parse-server < 8.6.105
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-27T13:42:07.586416Z'
published: '2026-10-26'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T14:16:07.428Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-116801'
references:
  - url: >-
      https://github.com/parse-community/parse-server/security/advisories/GHSA-58m4-cqvw-4vgh
    label: GitHub Security Advisory (GHSA-58m4-cqvw-4vgh)
  - url: >-
      https://www.vulncheck.com/advisories/parse-server-9.0.0-before-9.10.5-alpha.6-acl-bypass-via-relatedto-query
    label: >-
      VulnCheck Advisory: Parse Server 9.0.0 before 9.10.5-alpha.6 ACL Bypass
      via $relatedTo Query
tags:
  - cve.org
epss: 0.00253
epssPercentile: 0.16671
ingestedAt: '2026-10-27T16:11:59.450Z'
---

## Overview

Parse Server before 8.6.105 and 9.0.0 before 9.10.5-alpha.6 does not validate the owning object reference in $relatedTo relation queries, so supplying a query operator instead of an object ID bypasses the owning-object ACL check. A client with read access to at least one object of the owning class can disclose which readable objects are linked to owning objects it cannot read.

## Affected

- `parse-server >= 9.0.0 < 9.10.5-alpha.6`
- `parse-server < 8.6.105`

## Remediation

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