Open redirect in Flask-Security - CVE-2023-49438

Vulnerability details

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data passed via the ?next parameter on the /login and /register routes. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

Affected software

How to mitigate CVE-2023-49438

Links to Public Exploits and PoC-codes

• Exploit #10866 - CVE-2023-49438 (CVE-2023-49438 - Open Redirect Vulnerability in Flask-Security-Too) (November 15, 2024)

External References

• https://github.com/brandon-t-elliott/CVE-2023-49438
• https://github.com/Flask-Middleware/flask-security/releases/tag/5.3.3

Related Security Bulletins

• Open redirect in Flask-Security
• Fedora 39 update for python-flask-security-too