GHSA-6hgp-fmhr-mrg4 — Highcharts Grid: `javascript:` URL in credits.href runs script on click

Affected: npm: @highcharts/dashboards, npm: @highcharts/grid-pro

### Impact An attacker who controls the Grid configuration can set `credits.href` to a `javascript:` URL. The value is not validated against an allowed-scheme list before it is applied to the credits link, so activating that link runs attacker-supplied script in the origin of the page hosting the Grid. Exploitation requires that untrusted data reach the Grid configuration and that a user activate the credits link. Script running this way has the same access to page data, storage and session state as the hosting application.

### Workarounds Paste in after the Grid Pro module is imported, before a Grid is created.

```javascript const { AST } = Grid;

function sanitize(options) { const credits = options && options.credits;

if (credits && typeof credits.href === 'string') { const filtered = AST.filterUserAttributes({ href: credits.href });

if (!filtered.href) { delete credits.href; } }

return options; }

// Both Grid.grid() and grid.update() funnel through loadUserOptions, so one // hook covers both entry points. const { prototype } = Grid.Grid; const loadUserOptions = prototype.loadUserOptions;

prototype.loadUserOptions = function (options, ...rest) { sanitize(options); return loadUserOptions.call(this, 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,…

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GHSA-6hgp-fmhr-mrg4 — Highcharts Grid: `javascript:` URL in credits.href runs script on click