CVE-2026-118245

Highcharts Dashboards: chartConstructor is an unchecked lookup into the Highcharts namespace

(function () {
    const HighchartsComponent =
        Dashboards && Dashboards.HighchartsComponent;

    if (!HighchartsComponent || !HighchartsComponent.prototype.createChart) {
        return; // HighchartsComponent not loaded
    }

    const allowedConstructors = [
        'chart',
        'stockChart',
        'mapChart',
        'ganttChart'
    ];
    const originalCreateChart = HighchartsComponent.prototype.createChart;

    HighchartsComponent.prototype.createChart = function () {
        if (allowedConstructors.indexOf(this.chartConstructor) === -1) {
            this.chartConstructor = 'chart';
        }

        return originalCreateChart.apply(this, arguments);
    };
}());

The Highcharts component uses the value of chartConstructor to select a function from the Highcharts namespace and invokes it with the component's container element and its chartOptions, without checking the value against the supported chart constructors. An attacker who controls the dashboard configuration can therefore name any other public member of that namespace; utility functions in that namespace copy the supplied options onto the container element as properties or attributes, so markup and event handlers carried in chartOptions land in the page and run in the origin of the page hosting the dashboard. Exploitation requires that untrusted data reach the Dashboards component configuration. No user interaction is required beyond rendering the board.

Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.

Kodem intelligence

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1. What is CVE-2026-118245? CVE-2026-118245 is a high-severity cross-site scripting (XSS) vulnerability in @highcharts/dashboards (npm), affecting versions >= 1.0.0, <= 4.2.1. It is fixed in 4.2.2. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. Which versions of @highcharts/dashboards are affected by CVE-2026-118245? @highcharts/dashboards (npm) versions >= 1.0.0, <= 4.2.1 is affected.
3. Is there a fix for CVE-2026-118245? Yes. CVE-2026-118245 is fixed in 4.2.2. Upgrade to this version or later.
4. Is CVE-2026-118245 exploitable, and should I be worried? Whether CVE-2026-118245 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
5. What actually determines whether CVE-2026-118245 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
6. How do I fix CVE-2026-118245? Upgrade @highcharts/dashboards to 4.2.2 or later.

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