CVE-2026-21884

React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, 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. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.

The following products are affected by CVE-2026-21884 vulnerability.

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Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21884.

URL	Resource
https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7