remix-run/react-router · Security
React Router SSR XSS in ScrollRestoration
- GHSA ID
- GHSA-8v8x-cx79-35w7
- CVE ID
- CVE-2026-21884
- Severity
- high
- Published
- Updated
- CVSS
- 8.2 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
- CVSS v3
- 8.2 · 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 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>).
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-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/blob/react-router%407.12.0/CHANGELOG.md#v7120 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json ↗
- https://github.com/advisories/GHSA-8v8x-cx79-35w7 ↗