CVE-2026-33244 — React Router has stored XSS via unescaped Location header in prerendered redirect HTML
React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header…
Published: 2026-06-02 · CVSS: 5.4 · CVSS 3.1
React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically generated HTML files if the redirect location comes from an untrusted source. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.13.2.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7