Highcharts Grid Pro: cell-renderer `attributes` map written with raw `setAttribute`

### Impact The input-type cell renderers copy every entry of the renderer's `attributes` option onto the input or select element they create, without checking the attribute names. An attacker who controls the Grid configuration can supply entries under a column's `cells.renderer.attributes` or `cells.editMode.renderer.attributes` whose names are event handlers, and those handlers execute in the origin of the page hosting the Grid. A view renderer places the handler on the input rendered in every row of the column as soon as the Grid renders; an edit-mode renderer places it on the input created when a cell enters edit mode, and that input is focused immediately, so a `focus` handler runs as soon as the user starts editing. Exploitation requires that untrusted data reach the Grid configuration and that a user hover over or focus one of the rendered inputs, or begin editing a cell. The Pro DataGrid that shipped inside the Dashboards package is included. ### Workarounds If your column configuration comes from a source you do not fully control, paste this snippet right after importing the `Grid` module: ```ts const ALLOWED_RENDERER_ATTRIBUTES = [ 'autofocus', 'checked', 'max', 'maxlength', 'min', 'minlength', 'multiple', 'pattern', 'placeholder', 'size', 'step' ]; const scrubColumn = (column) => { const cells = column?.cells; for (const renderer of [cells?.renderer, cells?.editMode?.renderer]) { const attributes = renderer?.attributes; if (attributes) { for (const key of Object.keys(attributes)) { if (!ALLOWED_RENDERER_ATTRIBUTES.includes(key.toLowerCase())) { delete attributes[key]; } } } } return column; }; const scrubOptions = (options) => { scrubColumn(options?.columnDefaults); (options?.columns || []).forEach(scrubColumn); return options; }; const proto = Grid.Grid.prototype; const loadUserOptions = proto.loadUserOptions; proto.loadUserOptions = function (options, ...rest) { scrubOptions(Grid.defaultOptions); return loadUserOptions.call(this, scrubOptions(options), ...rest); }; const updateColumn = proto.updateColumn; proto.updateColumn = function (columnId, options, ...rest) { return updateColumn.call(this, columnId, scrubColumn(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).