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.

• CWE-79
• CWE-79

• https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:19712
• https://access.redhat.com/errata/RHSA-2026:3782
• https://access.redhat.com/errata/RHSA-2026:3958
• https://access.redhat.com/errata/RHSA-2026:3960
• https://access.redhat.com/security/cve/CVE-2026-21884
• https://bugzilla.redhat.com/show_bug.cgi?id=2428421
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json

Published

Jan 10, 2026

Last Modified

Jul 15, 2026

Status

Modified

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