CVE-2026-21884
React Router SSR XSS in ScrollRestoration
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.
INFO
Published Date :
Jan. 10, 2026, 3:15 a.m.
Last Modified :
Jan. 30, 2026, 6:19 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-21884
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update @remix-run/react to version 2.17.3 or later.
- Update react-router to version 7.12.0 or later.
- Ensure SSR framework mode is configured securely.
- Avoid untrusted content for SSR keys.
Public PoC/Exploit Available at Github
CVE-2026-21884 has a 8 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-21884.
| URL | Resource |
|---|---|
| https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7 | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-21884 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-21884
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Antigravity-Manager v4.1.21 with Claude Opus 4.6 native adaptive thinking support
Ruby Shell Dockerfile HTML PowerShell JavaScript Rust CSS TypeScript
🚀 AI 编辑器多账号代理工具 — 支持 Cursor / Claude Code / Codex / Gemini CLI / OpenCode / Droid，智能路由 · 自动轮换 · 配额保护 · 一键同步
Ruby Shell Dockerfile HTML JavaScript Rust CSS TypeScript
None
Ruby Shell Dockerfile HTML JavaScript Rust CSS TypeScript
None
Ruby Shell Dockerfile HTML JavaScript Rust CSS TypeScript
None
Ruby Shell Dockerfile HTML JavaScript Rust CSS TypeScript
Topoo Gateway - Antigravity Manager Fork
Ruby Shell Dockerfile HTML JavaScript Rust CSS TypeScript Assembly Python
Professional Antigravity Account Manager & Switcher. One-click seamless account switching for Antigravity Tools. Built with Tauri v2 + React (Rust).专业的 Antigravity 账号管理与切换工具。为 Antigravity 提供一键无缝账号切换功能。
account-manager antigravity
HTML JavaScript Rust CSS TypeScript Ruby Shell Dockerfile PowerShell
A website for greentech.lk.
JavaScript HTML CSS
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-21884 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-21884 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 30, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* versions from (including) 7.0.0 up to (including) 7.11.0 *cpe:2.3:a:shopify:remix-run/react:*:*:*:*:*:node.js:*:* versions up to (excluding) 2.17.3 Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7 Types: Third Party Advisory -
New CVE Received by [email protected]
Jan. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N Added CWE CWE-79 Added Reference https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7