Express.js Open Redirect in malformed URLs

An attacker can exploit this Open Redirect vulnerability by crafting a specially formatted URL that bypasses the intended redirect validation logic within the Express.js application. This allows them to redirect users to arbitrary external websites, potentially leading to phishing attacks, malware distribution, or account compromise. The attacker doesn't need any authentication to trigger this redirect; it's a client-side vulnerability. The blast radius is dependent on the application's user base and the sensitivity of the data handled by the application. A successful attack could result in significant reputational damage and financial losses for the affected organization.

1. Reserviert2024-03-14
2. Veröffentlicht2024-03-25
3. Geändert2026-02-04
4. EPSS aktualisiert2026-04-02

The primary mitigation for CVE-2024-29041 is to upgrade Express.js to version 4.19.2 or later. If upgrading is not immediately feasible, consider implementing stricter input validation and sanitization on the redirect URL within your application code. Employ a Web Application Firewall (WAF) with rules to block suspicious redirect patterns. Carefully review and test any custom redirect logic to ensure it is robust against malformed URLs. After upgrading, confirm the fix by attempting to trigger a redirect with a known malicious URL and verifying that it is blocked or handled safely.

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