---
id: CVE-2026-34595
title: >-
  Parse Server is an open source backend that can be deployed to any
  infrastructure that can run Node.js
summary: >-
  Parse Server is an open source backend that can be deployed to any
  infrastructure that can run Node.js. Prior to versions 8.6.70 and
  9.7.0-alpha.18, an authenticated user with find class-level permission can
  bypass the protectedFields cl…
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-843
vendor: parseplatform
product: parse-server
affected:
  - parse-server < 8.6.70
  - 'parse-server >= 9.0.0, < 9.7.0'
  - parse-server = 9.7.0
patched:
  - parse-server 9.7.0
published: '2026-03-31'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34595'
references:
  - url: >-
      https://github.com/parse-community/parse-server/commit/f63fd1a3fe0a7c1c5fe809f01b0e04759e8c9b98
    label: security-advisories@github.com
  - url: >-
      https://github.com/parse-community/parse-server/commit/ffad0ec6b971ee0dd9545e1bf1fb34ddebf275c2
    label: security-advisories@github.com
  - url: 'https://github.com/parse-community/parse-server/pull/10350'
    label: security-advisories@github.com
  - url: 'https://github.com/parse-community/parse-server/pull/10351'
    label: security-advisories@github.com
  - url: >-
      https://github.com/parse-community/parse-server/security/advisories/GHSA-mmg8-87c5-jrc2
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00431
epssPercentile: 0.34765
ingestedAt: '2026-07-24T20:38:02.595Z'
---

## Overview

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.70 and 9.7.0-alpha.18, an authenticated user with find class-level permission can bypass the protectedFields class-level permission setting on LiveQuery subscriptions. By sending a subscription with a $or, $and, or $nor operator value as a plain object with numeric keys and a length property (an "array-like" object) instead of an array, the protected-field guard is bypassed. The subscription event firing acts as a binary oracle, allowing the attacker to infer whether a protected field matches a given test value. This issue has been patched in versions 8.6.70 and 9.7.0-alpha.18.

## Affected

- `parse-server < 8.6.70`
- `parse-server >= 9.0.0, < 9.7.0`
- `parse-server = 9.7.0`

## Remediation

Upgrade past the affected range:

- `parse-server 9.7.0`