Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-33244— React Router has stored XSS via unescaped Location header in prerendered redirect HTML

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 7.5.1版本至7.13.1版本存在跨站脚本漏洞，该漏洞源于在启用预渲染的框架模式下对HTTP Location标头值中和不当，可能导致静态生成HTML文件中出现跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
remix-run react-router >= 7.5.1, < 7.13.2 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-33244

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
React Router has stored XSS via unescaped Location header in prerendered redirect HTML
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions 7.5.1 through 7.13.1, when using Framework Mode with pre-rendering enabled, improper neutralization of the HTTP `Location` header value can permit Cross-Site Scripting (XSS) in the statically generated HTML files if the redirect location comes from an untrusted source. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in version 7.13.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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 7.5.1版本至7.13.1版本存在跨站脚本漏洞，该漏洞源于在启用预渲染的框架模式下对HTTP Location标头值中和不当，可能导致静态生成HTML文件中出现跨站脚本攻击。
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 >= 7.5.1, < 7.13.2 -

II. Public POCs for CVE-2026-33244

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-33244

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-33244 (1)

Same Patch Batch · remix-run · 2026-06-02 · 6 CVEs total

CVE-2026-42211 8.1 HIGH React Router's vendored turbo-stream v2 allows arbitrary constructor invocation via TYPE_E
CVE-2026-33245 8.0 HIGH React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect
CVE-2026-42342 7.5 HIGH React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
CVE-2026-34077 7.5 HIGH React Router vulnerable to Denial of Service via reflected user input in single-fetch
CVE-2026-40181 6.6 MEDIUM React Router's same-origin redirect with path starting // causes open redirect via protoco

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-33244

No comments yet

Leave a comment