GHSA-f22v-gfqf-p8f3
React Router has stored XSS via unescaped Location header in prerendered redirect HTML
At a glance
- Published
- Updated
- CVE
- CVE-2026-33244
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Description
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>`).
Affected packages
| Package | Versions |
|---|---|
| npm · react-router | introduced 7.5.1, fixed 7.13.2 |
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-f22v-gfqf-p8f3 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33244 ADVISORY
- https://github.com/remix-run/react-router/pull/14880 WEB
- https://github.com/remix-run/react-router/commit/ea28e66926460656815cee9b7f2dfaa872513a8c WEB
- https://github.com/remix-run/react-router PACKAGE
- https://github.com/remix-run/react-router/blob/react-router%407.13.2/CHANGELOG.md#v7132 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |