Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Shopify | React-Router | >= 7.0.0, <= 7.11.0 |
| Shopify | Remix-Run\/React | < 2.17.3 |
Related Weaknesses (CWE)
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35wThird Party Advisory
FAQ
What is CVE-2026-21884?
CVE-2026-21884 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 Frame...
How severe is CVE-2026-21884?
CVE-2026-21884 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-21884?
Check the references section above for vendor advisories and patch information. Affected products include: Shopify React-Router, Shopify Remix-Run\/React.