CVE-2026-33244: React Router has stored XSS via unescaped Location header in prerendered redirect HTML
(updated )
When using React Router v7 Framework Mode with Pre-rendering enabled, an improper neutralization of the HTTP Location header value can permit Cross-Site Scripting (XSS) in statically generated HTML files if the redirect location comes from an untrusted source.
[!NOTE] This does not impact your React Router application if you are using Declarative Mode (
<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).
References
- github.com/advisories/GHSA-f22v-gfqf-p8f3
- github.com/remix-run/react-router/blob/react-router%407.13.2/CHANGELOG.md
- github.com/remix-run/react-router/commit/ea28e66926460656815cee9b7f2dfaa872513a8c
- github.com/remix-run/react-router/pull/14880
- github.com/remix-run/react-router/security/advisories/GHSA-f22v-gfqf-p8f3
- nvd.nist.gov/vuln/detail/CVE-2026-33244
Code Behaviors & Features
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