high8.2
CVE-2026-21884
React Router SSR XSS in ScrollRestoration
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | react-router | >= 7.0.0, < 7.12.0 | 7.12.0 |
| npm | @remix-run/react | < 2.17.3 | 2.17.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Shopify | React-Router | from 7.0.0 through 7.11.0 |
| Shopify | Remix-Run\/React | before 2.17.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7
- https://access.redhat.com/errata/RHSA-2026:19712
- https://access.redhat.com/errata/RHSA-2026:3782
- https://access.redhat.com/errata/RHSA-2026:3958
- https://access.redhat.com/errata/RHSA-2026:3960
- https://access.redhat.com/security/cve/CVE-2026-21884
- https://bugzilla.redhat.com/show_bug.cgi?id=2428421
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json
- https://github.com/advisories/GHSA-8v8x-cx79-35w7
- https://nvd.nist.gov/vuln/detail/CVE-2026-21884
- https://github.com/remix-run/react-router/pull/14705
- https://github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608d
- https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120