Highcharts Dashboardsに任意のスクリプトを実行される脆弱性

Impact

The component language strings shown in the edit mode sidebar are parsed as HTML rather than inserted as text. An attacker who controls those language options can supply markup carrying event handlers, which execute in the origin of the page hosting the dashboard once the sidebar renders the affected labels. Exploitation requires that untrusted data reach the Dashboards language configuration and that a user open the edit mode sidebar.

Workarounds

Until you can upgrade, patch EditMode once at application startup. The hook runs before the sidebar is built, so the labels are already harmless by the time they are rendered. Assigning a string to textContent and reading back innerHTML turns any markup into literal text, which is exactly what the fixed version renders.

After importing the module, use this code snipped once, before any board is created.

{
    const EditMode = window.Dashboards?.EditMode;
    const escapeHTML = (text) => text
        .replace(/&/g, '&')
        .replace(//g, '>');
    const patched = new WeakSet();
    const originalInit = EditMode.prototype.init;

    EditMode.prototype.init = function (...args) {
        const labels = this.lang?.sidebar;

        if (labels && !patched.has(this)) {
            patched.add(this);

            for (const key of Object.keys(labels)) {
                if (typeof labels[key] === 'string') {
                    labels[key] = escapeHTML(labels[key]);
                }
            }…