---
id: "CVE-2026-118253"
kind: "vulnerability"
aliases: ["CVE-2026-118253", "GHSA-58g7-7f52-h92c"]
title: "Highcharts Dashboards parses fullscreen labels as HTML"
severity: "high"
cvss: 8.4
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@highcharts/dashboards", "fixed": ["4.2.3"], "affected": ">= 1.0.0, < 4.2.3", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-79", "dashboards", "frontend", "highcharts", "javascript", "package"]
not_affected_if: ["default-config", "no-user-controlled-language", "static-charts"]
published_at: "2026-10-28T19:17:29+00:00"
first_seen_at: "2026-10-28T19:34:54+00:00"
updated_at: "2026-10-28T20:01:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118253", "first_seen_at": "2026-10-28T19:34:54+00:00"}, {"source": "ghsa", "url": "https://github.com/advisories/GHSA-58g7-7f52-h92c", "first_seen_at": "2026-10-28T20:01:43+00:00"}]
---

# Highcharts Dashboards parses fullscreen labels as HTML

Highcharts Dashboards edit mode parses fullscreen language labels as HTML instead of text, from version 1.0.0 through 4.2.3. An attacker who controls Dashboards language options can supply markup with event handlers that run in the hosting page origin when the fullscreen control renders.

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

## Affected

- npm:@highcharts/dashboards affected >= 1.0.0, < 4.2.3 fixed 4.2.3

## How to check

- Check the installed Highcharts version with `npm ls highcharts` or the version in the page's script URL.
- Look for Dashboards edit mode enabled and `viewFullscreen` in the context-menu items.
- Check whether language options for Dashboards come from user-controlled input.

## Fix

- Upgrade Highcharts to `4.2.3` or later.

## Timeline

- 2026-10-28T19:34:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118253
- 2026-10-28T20:01:43+00:00 ghsa https://github.com/advisories/GHSA-58g7-7f52-h92c

## From the sources

### Impact
The edit mode fullscreen labels are parsed as HTML when the corresponding control is rendered. An attacker who controls the Dashboards language options can supply markup carrying event handlers, which then execute in the origin of the page hosting the dashboard. Exploitation requires that untrusted data reach the Dashboards language configuration and that the affected control be rendered. Script running this way has the same access to page data, storage and session state as the hosting application.

### Workarounds

Until you can upgrade, replace `Fullscreen.prototype.setButtonText` atapplication startup. The replacement is the original method with `textContent` in place of `innerHTML`.

#### If you install Dashboards from npm

Import the module once, before any board is created.

```js
import Fullscreen from '@highcharts/dashboards/es-modules/Dashboards/EditMode/Fullscreen.js';

Fullscreen.prototype.setButtonText = function () {
    const editMode = this.board.editMode,
        button = editMode?.tools.contextMenu?.items.viewFullscreen;

    if (button?.innerElement) {
        const lang = editMode.lang;

        button.innerElement.textContent =
            (this.isOpen ? lang.exitFullscreen : lang.viewFullscreen) || '';
    }
};
```

#### If you load Dashboards from a `<script>` tag

The same replacement, taking `Fullscreen` from the global namespace. It must run after `modules/layout` and before any board is created.

```html
<script src="https://code.highcharts.com/dashboards/dashboards.js"></script>
<script src="https://code.highcharts.com/dashboards/modules/layout.js"></script>
<script>
{
    const Fullscreen = window.Dashboards?.Fullscreen;

    Fullscreen.prototype.setButtonText = function () {
        const editMode = this.board.editMode,
            button = editMode?.tools.contextMenu?.items.viewFullscreen;

        if (button?.innerElement) {
            const lang = editMode.lang;

            button.innerElement.textContent =
                (this.isOpen ? lang.exitFullscreen : lang.viewFullscreen) || '';
        }
    };
}
</script>
```

If your application does not need Edit Mode, leaving it disabled (`editMode.enabled: false`) removes the exposure as well. The same applies to the context menu — the label is only reachable when `viewFullscreen` is among `editMode.contextMenu.items`.

### 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/dashboards@4.2.3`. If you load Highcharts Dashboards from a CDN, use a versioned URL, for example `https://code.highcharts.com/dashboards/4.2.3/dashboards.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/dashboards/installation).

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