remix-run/react-router · Security
React Router has stored XSS via unescaped Location header in prerendered redirect HTML
- GHSA ID
- GHSA-f22v-gfqf-p8f3
- CVE ID
- CVE-2026-33244
- Severity
- medium
- Published
- Updated
- CVSS
- 5.4 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CVSS v3
- 5.4 · 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 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>).
CWEs
- CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-f22v-gfqf-p8f3 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-33244 ↗
- https://github.com/remix-run/react-router/pull/14880 ↗
- https://github.com/remix-run/react-router/commit/ea28e66926460656815cee9b7f2dfaa872513a8c ↗
- https://github.com/remix-run/react-router/blob/react-router%407.13.2/CHANGELOG.md#v7132 ↗
- https://github.com/advisories/GHSA-f22v-gfqf-p8f3 ↗