CVE-2026-118254

Highcharts Grid parses pagination language options as HTML

{
    const Pagination = Grid.Pagination;

    const escapeLang = (pagination) => {
        const lang = pagination.lang;
        if (!lang) {
            return;
        }

        for (const key of ['pageInfo', 'pageSizeLabel']) {
            if (typeof lang[key] === 'string') {
                lang[key] = lang[key].replace(/</g, '&lt;');
            }
        }
    };

    for (const name of ['updatePageInfo', 'renderPageSizeSelector']) {
        const original = Pagination.prototype[name];

        Pagination.prototype[name] = function (...args) {
            escapeLang(this);
            return original.apply(this, args);
        };
    }
}

The pagination language strings are written into the DOM as markup rather than as text. An attacker who controls those language options can supply elements carrying event handlers, and those handlers execute in the origin of the page hosting the Grid when the pagination controls render. Exploitation requires that untrusted data reach the Grid language configuration and that pagination be enabled on the Grid.

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-2026-118254? CVE-2026-118254 is a high-severity cross-site scripting (XSS) vulnerability in @highcharts/grid-lite (npm), affecting versions >= 2.0.0, <= 3.1.0. It is fixed in 3.2.0. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
2. Which packages are affected by CVE-2026-118254?
   • @highcharts/grid-lite (npm) (versions >= 2.0.0, <= 3.1.0)
   • @highcharts/grid-pro (npm) (versions >= 2.0.0, <= 3.1.0)
3. Is there a fix for CVE-2026-118254? Yes. CVE-2026-118254 is fixed in 3.2.0. Upgrade to this version or later.
4. Is CVE-2026-118254 exploitable, and should I be worried? Whether CVE-2026-118254 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-2026-118254 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-2026-118254?
   • Upgrade @highcharts/grid-lite to 3.2.0 or later
   • Upgrade @highcharts/grid-pro to 3.2.0 or later

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