GHSA-8v8x-cx79-35w7
React Router SSR XSS in ScrollRestoration
At a glance
- Published
- Updated
- CVE
- CVE-2026-21884
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Description
A XSS vulnerability exists in in React Router's `<ScrollRestoration>` API in [Framework Mode](https://reactrouter.com/start/modes#framework) when using the `getKey`/`storageKey` props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. > [!NOTE] > This does not impact applications if developers have [disabled server-side rendering](https://reactrouter.com/how-to/spa) in Framework Mode, or if they 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 7.0.0, fixed 7.12.0 |
| npm · @remix-run/react | introduced 0, fixed 2.17.3 |
References
- https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-21884 ADVISORY
- https://github.com/remix-run/react-router/pull/14705 WEB
- https://github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608d WEB
- https://access.redhat.com/errata/RHSA-2026:19712 WEB
- https://access.redhat.com/errata/RHSA-2026:3782 WEB
- https://access.redhat.com/errata/RHSA-2026:3958 WEB
- https://access.redhat.com/errata/RHSA-2026:3960 WEB
- https://access.redhat.com/security/cve/CVE-2026-21884 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2428421 WEB
- https://github.com/remix-run/react-router PACKAGE
- https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120 WEB
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |