React Router SSR XSS in ScrollRestoration
A XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode 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 in Framework Mode, or if they are using Declarative Mode (
<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | react-router | >= 7.0.0, < 7.12.0 | 7.12.0 |
| npm package | @remix-run/react | < 2.17.3 | 2.17.3 |
References
- https://github.com/remix-run/react-router/security/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://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://github.com/remix-run/react-router
- https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm
- Package
react-router, @remix-run/react- Disclosed
- 08.01.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8v8x-cx79-35w7 - CC BY 4.0
Vulnerability history: @remix-run/react
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 01.2026 01.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2026: 2
-
React Router SSR XSS in ScrollRestoration this entry
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