---
id: CVE-2026-118248
title: 'Highcharts Dashboards: editableOptions.propertyPath writes to Object.prototype'
summary: >-
  Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until
  4.2.2, Highcharts Dashboards edit mode walks editableOptions propertyPath
  segments without rejecting prototype-related keys. An attacker who controls
  editableO…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:H/SC:L/SI:L/SA:L'
cvssSource: cna
cwe:
  - CWE-1321
vendor: highcharts
product: highcharts
affected:
  - highcharts < 13.1.0
  - 'dashboards >= 1.0.0, < 4.2.2'
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T17:55:47.520Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118248'
references:
  - url: >-
      https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm
    label: >-
      https://github.com/highcharts/highcharts/security/advisories/GHSA-wg5j-9wp8-2ggm
  - url: >-
      https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22edaad978b
    label: >-
      https://github.com/highcharts/highcharts/commit/05efb9849130461fe61992ea8f58d22edaad978b
  - url: 'https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2'
    label: 'https://github.com/highcharts/highcharts/releases/tag/dashboards-v4.2.2'
tags:
  - cve.org
ingestedAt: '2026-10-28T18:15:46.375Z'
---

## Overview

Highcharts JS is a JavaScript charting library based on SVG. From 1.0.0 until 4.2.2, Highcharts Dashboards edit mode walks editableOptions propertyPath segments without rejecting prototype-related keys. An attacker who controls editableOptions can provide a path through __proto__ or constructor, and a user's edit writes the configured value onto Object.prototype. The property then becomes visible to JavaScript throughout the page, with consequences determined by the consuming application. This issue is fixed in 4.2.2.

## Affected

- `highcharts < 13.1.0`
- `dashboards >= 1.0.0, < 4.2.2`

## Remediation

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