VULNERABILITY INTELLIGENCE

CVE-2026-21884

CVSS score8.2 HIGH
EPSS probability0.53%
CISA KEVNot currently listed
Published2026-01-10
Last modified2026-07-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-79
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-79

Primary references