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

### Impact 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. ### Workarounds If your board configuration comes from a source you do not fully control, paste this snippet right after importing libraries: ```ts (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); }; }()); ``` ### 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/[email protected]`. If you load Highcharts Dashboards from a CDN, use a versioned URL, for example `https://code.highcharts.com/dashboards/4.2.2/dashboards.js`. For more on each installation method, see the [installation guide](https://www.highcharts.com/docs/dashboards/installation).

Source published

28 Oct 2026 19:55:41 UTC

Source modified

28 Oct 2026 20:15:05 UTC

Observed here

28 Oct 2026 20:55:42 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N

Publisher rating · HIGH