CVE-2026-21884

Published Jan 10, 2026

Last updated 4 months ago

Overview

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.
Source
security-advisories@github.com
NVD status
Analyzed
Products
react-router, remix-run\/react

Risk scores

CVSS 3.1

Type
Secondary
Base score
8.2
Impact score
4.7
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Severity
HIGH

Weaknesses

security-advisories@github.com
CWE-79

Social media

Hype score
Not currently trending

Configurations