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CVE-2025-43865— React Router allows pre-render data spoofing on React-Router framework mode

Quick assessment

Affected
remix-run react-router
Exploitation
Public or AI PoC available; prioritize validation
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 7.5.2之前版本存在数据伪造问题漏洞，该漏洞源于通过添加请求标头可能修改预渲染数据。

CVSS 8.2 · High EPSS 0.80% · P55

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-43865

Vulnerability Information
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Vulnerability Title
React Router allows pre-render data spoofing on React-Router framework mode
Source: CVE Program / CVE List V5
Vulnerability Description
React Router is a router for React. In versions on the 7.0 branch prior to version 7.5.2, it's possible to modify pre-rendered data by adding a header to the request. This allows to completely spoof its contents and modify all the values ​​of the data object passed to the HTML. This issue has been patched in version 7.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
react-router 数据伪造问题漏洞
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 7.5.2之前版本存在数据伪造问题漏洞，该漏洞源于通过添加请求标头可能修改预渲染数据。
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 >= 7.0, < 7.5.2 -

II. Public POCs for CVE-2025-43865

# POC Description Source Link Shenlong Link
1 None https://github.com/pouriam23/Pre-render-data-spoofing-on-React-Router-framework-mode-CVE-2025-43865 POC Details
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Qwen3.6-35B-A3B · 9121 chars
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III. Intelligence Information for CVE-2025-43865

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Patches & Fixes for CVE-2025-43865 (2)

Vendor Advisories for CVE-2025-43865 (1)

IV. Related Vulnerabilities

Same product: react-router
Same vendor: remix-run
Same weakness: CWE-345

V. Comments for CVE-2025-43865

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