CVE-2026-21884
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Summary
React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, 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. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| remix-run | react-router | @remix-run/react < 2.17.3 | affected |
| remix-run | react-router | react-router >= 7.0.0, < 7.12.0 | affected |
Weaknesses
- CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: total
react-router: @remix-run/react: React Router SSR XSS in ScrollRestoration
Additional References
- 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://access.redhat.com/errata/RHSA-2026:3958
- https://access.redhat.com/errata/RHSA-2026:3960
- https://access.redhat.com/errata/RHSA-2026:3782
- https://access.redhat.com/errata/RHSA-2026:19712
References
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