---
id: "CVE-2026-118255"
kind: "vulnerability"
aliases: ["CVE-2026-118255", "GHSA-6hgp-fmhr-mrg4"]
title: "Highcharts Grid: `javascript:` URL in credits.href runs script on click"
severity: "high"
cvss: 8.4
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "@highcharts/dashboards", "fixed": ["4.0.0"], "affected": ">= 3.2.0, <= 3.6.0", "ecosystem": "npm"}, {"name": "@highcharts/grid-pro", "fixed": ["3.2.0"], "affected": ">= 2.0.0, <= 3.1.0", "ecosystem": "npm"}]
ecosystems: ["npm"]
tags: ["cwe-79", "dashboards", "frontend", "highcharts", "javascript", "package"]
not_affected_if: ["already-on-3.2.0", "fixed-configuration"]
published_at: "2026-10-28T19:17:29+00:00"
first_seen_at: "2026-10-28T19:34:55+00:00"
updated_at: "2026-10-28T20:01:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118255", "first_seen_at": "2026-10-28T19:34:55+00:00"}, {"source": "ghsa", "url": "https://github.com/advisories/GHSA-6hgp-fmhr-mrg4", "first_seen_at": "2026-10-28T20:01:43+00:00"}]
---

# Highcharts Grid: `javascript:` URL in credits.href runs script on click

Highcharts Grid applies a configured credits.href to the credits link without checking the URL scheme, so a javascript: URL is accepted. When a user activates that link, the script runs in the hosting page's origin with access to the application's data and session.

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

## Affected

- npm:@highcharts/dashboards affected >= 3.2.0, <= 3.6.0 fixed 4.0.0
- npm:@highcharts/grid-pro affected >= 2.0.0, <= 3.1.0 fixed 3.2.0

## How to check

- Check the installed Highcharts Grid version in the project's package manifest or lockfile, for example `npm ls highcharts-grid` or `grep -i highcharts-grid package-lock.json`
- Look for code that sets `credits.href` from user-supplied or stored configuration

## Fix

- Upgrade Grid Pro to `3.2.0` or later
- Until upgraded, do not allow untrusted users to set Grid configuration, and disable or sanitize `credits.href`

## Timeline

- 2026-10-28T19:34:55+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118255
- 2026-10-28T20:01:43+00:00 ghsa https://github.com/advisories/GHSA-6hgp-fmhr-mrg4

## From the sources

### Impact
An attacker who controls the Grid configuration can set `credits.href` to a `javascript:` URL. The value is not validated against an allowed-scheme list before it is applied to the credits link, so activating that link runs attacker-supplied script in the origin of the page hosting the Grid. Exploitation requires that untrusted data reach the Grid configuration and that a user activate the credits link. Script running this way has the same access to page data, storage and session state as the hosting application.

### Workarounds
Paste in after the Grid Pro module is imported, before a Grid is created.

```javascript
const { AST } = Grid;

function sanitize(options) {
    const credits = options && options.credits;

    if (credits && typeof credits.href === 'string') {
        const filtered = AST.filterUserAttributes({ href: credits.href });

        if (!filtered.href) {
            delete credits.href;
        }
    }

    return options;
}

// Both Grid.grid() and grid.update() funnel through loadUserOptions, so one
// hook covers both entry points.
const { prototype } = Grid.Grid;
const loadUserOptions = prototype.loadUserOptions;

prototype.loadUserOptions = function (options, ...rest) {
    sanitize(options);
    return loadUserOptions.call(this, options, ...rest);
};
```

### 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/grid-lite@3.2.0`. If you load Highcharts Grid from a CDN, use a versioned URL, for example `https://cdn.jsdelivr.net/npm/@highcharts/grid-lite@3.2.0/grid-lite.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/grid/installation).

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