A XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys.
[!NOTE] This does not impact applications if developers have disabled server-side rendering in Framework Mode, or if they are using Declarative Mode (
<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).
{
"cwe_ids": [
"CWE-79"
],
"nvd_published_at": "2026-01-10T03:15:48Z",
"github_reviewed_at": "2026-01-08T20:50:05Z",
"github_reviewed": true,
"severity": "HIGH"
}