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CVE-2025-43864: React Router Vulnerability Leading to Cache Poisoning and Application Compromise

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Overview

The vulnerability CVE-2025-43864 affects versions 7.2.0 to 7.5.1 of React Router, a popular router used in React applications. Exploitation of this vulnerability can lead to cache poisoning, resulting in severe application disruption or even system compromise. As React Router is widely used within various web applications, the impact of this vulnerability is broad and significant.

Vulnerability Summary

CVE ID: CVE-2025-43864
Severity: High (7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Successful exploitation results in application disruption due to cache poisoning, potentially leading to system compromise and data leakage.

Affected Products

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Product | Affected Versions

React Router | 7.2.0 to 7.5.1

How the Exploit Works

The exploit takes advantage of a flaw in the React Router. By adding a specific header to a request, an attacker can force the application to switch from Server-Side Rendering (SSR) to Single Page Application (SPA) mode. This causes an error that corrupts the application page. If a cache system is present, the error response can be cached, resulting in cache poisoning. This disrupts the application’s availability and can potentially lead to system compromise or data leakage.

Conceptual Example Code

Here is a conceptual example of an HTTP request that might be used to exploit this vulnerability:

GET / HTTP/1.1
Host: target.example.com
X-Force-SPA: true

This request includes the custom `X-Force-SPA` header (not a real header, used for illustrative purposes), designed to force the application into SPA mode from SSR, thereby triggering the vulnerability.

Mitigation

Users are advised to apply the vendor patch (version 7.5.2) to mitigate the vulnerability. If immediate patching is not possible, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation until the patch can be applied.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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