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CVE-2026-21884— React Router SSR XSS in ScrollRestoration

Quick assessment

Affected
remix-run react-router
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

react-router是Remix开源的一个 React 的声明式路由。 React Router 7.0.0版本至7.11.0版本存在跨站脚本漏洞，该漏洞源于服务器端渲染期间使用不受信任内容生成密钥，可能导致跨站脚本攻击。

CVSS 8.2 · High EPSS 0.48% · P40

Affected Version Matrix 2

VendorProduct Version RangeStatus
remix-run react-router @remix-run/react < 2.17.3 affected
react-router >= 7.0.0, < 7.12.0 affected
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I. Basic Information for CVE-2026-21884

Vulnerability Information
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Vulnerability Title
React Router SSR XSS in ScrollRestoration
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
react-router 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
react-router是Remix开源的一个 React 的声明式路由。 React Router 7.0.0版本至7.11.0版本存在跨站脚本漏洞，该漏洞源于服务器端渲染期间使用不受信任内容生成密钥，可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
remix-run react-router @remix-run/react < 2.17.3 -

II. Public POCs for CVE-2026-21884

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III. Intelligence Information for CVE-2026-21884

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Vendor Advisories for CVE-2026-21884 (1)

Same Patch Batch · remix-run · 2026-01-10 · 6 CVEs total

CVE-2025-61686 9.1 CRITICAL React Router has Path Traversal in File Session Storage
CVE-2026-22029 8.0 HIGH React Router vulnerable to XSS via Open Redirects
CVE-2025-59057 7.6 HIGH React Router has XSS Vulnerability
CVE-2026-22030 6.5 MEDIUM React Router has CSRF issue in Action/Server Action Request Processing
CVE-2025-68470 6.5 MEDIUM React Router has unexpected external redirect via untrusted paths

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-79

V. Comments for CVE-2026-21884

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