React Router has stored XSS via unescaped Location header in prerendered redirect HTML
When using React Router v7 [Framework Mode](https://reactrouter.com/start/modes#framework) with [Pre-rendering](https://reactrouter.com/how-to/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](https://reactrouter.com/start/modes#declarative) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33244US | — | — | ||
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 va… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/remix-run/react-routerPACKAGE
- https://github.com/remix-run/react-router/blob/react-router%407.13.2/CHANGELOG.md#v7132WEB
- https://github.com/remix-run/react-router/commit/ea28e66926460656815cee9b7f2dfaa872513a8cWEB
- https://github.com/remix-run/react-router/pull/14880WEB
- https://github.com/remix-run/react-router/security/advisories/GHSA-f22v-gfqf-p8f3WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33244ADVISORY
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