---
id: "CVE-2026-118244"
kind: "vulnerability"
aliases: ["CVE-2026-118244", "GHSA-65hg-cf3f-5m39"]
title: "Highcharts Core: HTML text parsing falls back to unfiltered `innerHTML` during printing"
severity: "high"
cvss: 7.2
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "highcharts", "fixed": ["12.6.1"], "affected": ">= 12.0.0, < 12.6.1", "ecosystem": "npm"}, {"name": "highcharts", "fixed": ["13.1.0"], "affected": ">= 13.0.0, <= 13.0.2", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["charts", "cwe-79", "frontend", "highcharts", "javascript", "package"]
not_affected_if: ["no-beforeprint-redraw", "static-chart-text"]
published_at: "2026-10-28T18:17:15+00:00"
first_seen_at: "2026-10-28T18:34:33+00:00"
updated_at: "2026-10-28T19:56:29+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118244", "first_seen_at": "2026-10-28T18:34:33+00:00"}, {"source": "ghsa", "url": "https://github.com/advisories/GHSA-65hg-cf3f-5m39", "first_seen_at": "2026-10-28T19:56:29+00:00"}]
---

# Highcharts Core: HTML text parsing falls back to unfiltered `innerHTML` during printing

Highcharts falls back to raw innerHTML when DOMParser fails, and in Chromium a Trusted Types error during a beforeprint redraw lets untrusted chart text insert HTML. Event handlers in that markup then run in the page origin when printing starts.

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

## Affected

- npm:highcharts affected >= 12.0.0, < 12.6.1 fixed 12.6.1
- npm:highcharts affected >= 13.0.0, <= 13.0.2 fixed 13.1.0

## How to check

- Check the installed Highcharts version with `npm ls highcharts` or by reading `node_modules/highcharts/package.json`, and look for versions from `12.0.0` through `12.6.1` or `13.0.0` through `13.1.0`
- Look for a `beforeprint` handler that redraws charts and renders untrusted text in titles, labels or data labels

## Fix

- Upgrade Highcharts to `12.6.1` or `13.1.0`
- Until then, do not pass untrusted text into chart options that render as HTML, and avoid redrawing charts in `beforeprint` handlers

## Timeline

- 2026-10-28T18:34:33+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118244
- 2026-10-28T19:56:29+00:00 ghsa https://github.com/advisories/GHSA-65hg-cf3f-5m39

## From the sources

### Impact
When the HTML text parser cannot obtain a document from `DOMParser` because the call throws, it falls back to assigning the raw markup to the `innerHTML` of an element created in the hosting document, and the allow-list is applied only to the resulting DOM afterwards. In Chromium the Trusted Types policy callback that the parser uses throws while a `beforeprint` handler is running, so if the hosting page re-renders the chart from a `beforeprint` handler, every HTML-rendered text option parsed at that moment, such as `useHTML` titles, axis labels and data labels or text set by responsive rules, is inserted unsanitized, and event handlers embedded in that markup run in the origin of the page hosting the chart. Exploitation requires that untrusted data reach the chart configuration, that the hosting page update the chart from a `beforeprint` handler in Chromium, and that printing be started, which the print item of the exporting menu does on its own. Charts built with Highcharts Stock, Maps and Gantt are included, since those ship from the same package as Core.

### Workarounds
**Drop-in fix - for any versions affected (12.0.0-13.0.2).**
Add the below IIFE to run after Highcharts is loaded. 
```
((n)=>{n.AST.prototype.parseMarkup=function parseMarkup(t){let e,i=[];t=t.trim().replace(/ style=(["'])/g," data-style=$1");try{e=new DOMParser().parseFromString(tI?tI.createHTML(t):t,"text/html")}catch{}if(!e)try{e=new DOMParser().parseFromString(t,"text/html")}catch{}e||((e=n.doc.implementation.createHTMLDocument("")).body.innerHTML=t);let s=(t,e)=>{let i=t.localName||t.nodeName.toLowerCase(),o={tagName:i};"#text"===i&&(o.textContent=t.textContent||"");let r=t.attributes;if(r){let t={};[].forEach.call(r,e=>{"data-style"===e.name?o.style=tB.parseStyle(e.value):t[e.name]=e.value}),o.attributes=t}if(t.childNodes.length){let e=[];[].forEach.call(t.childNodes,t=>{s(t,e)}),e.length&&(o.children=e)}e.push(o)};return[].forEach.call(e.body.childNodes,t=>s(t,i)),i};})(Highcharts);
```
[Live demo & testing](https://jsfiddle.net/BlackLabel/pb6jLf7g/)

### Obtaining the patched version
The patched releases are available from all the usual distribution channels. With npm, upgrade the affected package to the patched version listed above, for example npm install highcharts@13.1.0. If you load Highcharts from the CDN, use the versioned URLs on code.highcharts.com, for example https://code.highcharts.com/13.1.0/highcharts.js. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/getting-started/installation).

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