---
id: CVE-2026-21884
title: React Router is a router for React
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/stora…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N'
cwe:
  - CWE-79
vendor: shopify
product: react-router
affected:
  - 'react-router >= 7.0.0, <= 7.11.0'
  - remix-run/react < 2.17.3
patched:
  - remix-run/react 2.17.3
published: '2026-01-10'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21884'
references:
  - url: >-
      https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:19712'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:3782'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:3958'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:3960'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-21884'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2428421'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21884'
  - url: 'https://github.com/remix-run/react-router/pull/14705'
  - url: >-
      https://github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608d
  - url: >-
      https://github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.md#v7120
  - url: 'https://github.com/advisories/GHSA-8v8x-cx79-35w7'
tags:
  - nvd
  - ghsa
  - npm
epss: 0.00539
epssPercentile: 0.42869
ingestedAt: '2026-06-30T13:26:50.278Z'
aliases:
  - GHSA-8v8x-cx79-35w7
ecosystem: npm
---

## Overview

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

- `react-router >= 7.0.0, <= 7.11.0`
- `remix-run/react < 2.17.3`

## Remediation

Upgrade past the affected range:

- `remix-run/react 2.17.3`

## Package advisory (CVE-2026-21884)

Affected packages:

- `react-router >= 7.0.0, < 7.12.0`
- `@remix-run/react < 2.17.3`

Patched in:

- `react-router 7.12.0`
- `@remix-run/react 2.17.3`

Source: https://github.com/advisories/GHSA-8v8x-cx79-35w7