React Router SSR XSS in ScrollRestoration_CVE-2026-21884

8.2 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

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.

Basic Information

ID CVE-2026-21884

Source GitHub_M

Published Jan 10, 2026 at 02:41

Affected Product

Vendor remix-run

Product react-router

Version @remix-run/react < 2.17.3

Affected Versions remix-run react-router @remix-run/react < 2.17.3
remix-run react-router react-router >= 7.0.0, < 7.12.0

CWE Classification

CWE-79

References

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

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    "published": "2026-01-10T02:41:44.944Z",
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