---
id: "CVE-2026-119571"
kind: "vulnerability"
aliases: ["CVE-2026-119571"]
title: "Parse Server: installation authorization flaw lets attackers change other installations' protected fields"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["node.js", "package", "parse-server", "self-hosted"]
not_affected_if: ["default-config", "outside-version-range"]
published_at: "2026-10-30T14:16:45+00:00"
first_seen_at: "2026-10-30T14:30:54+00:00"
updated_at: "2026-10-30T14:32:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119571", "first_seen_at": "2026-10-30T14:30:54+00:00"}]
---

# Parse Server: installation authorization flaw lets attackers change other installations' protected fields

Parse Server applies updates to an _Installation object to the installation named in a request header instead of the targeted one, when protectedFieldsTriggerExempt is enabled. An attacker who knows another installation's object ID can make a beforeSave trigger process that installation's protected fields.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Parse Server version in `package.json` or `npm ls parse-server`; affected range is `9.7.0` up to but not including `9.10.5-alpha.10`
- Check whether `protectedFieldsTriggerExempt` is enabled in the server configuration

## Fix

- Parse Server: move to `9.10.5-alpha.10` or later

## Timeline

- 2026-10-30T14:30:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119571

## From the sources

Parse Server from 9.7.0 before 9.10.5-alpha.10 contains an authorization flaw that applies _Installation updates addressed by object ID to the installation named in the X-Parse-Installation-Id header. When protectedFieldsTriggerExempt is enabled, attackers knowing another installation's object ID can make a beforeSave trigger process that installation's protected fields while writing elsewhere.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_