CVE-2025-43931

CRITICAL

Published Jul 7, 2025 Modified Apr 15, 2026 CWE-640

Description

flask-boilerplate through a170e7c allows account takeover via the password reset feature because SERVER_NAME is not configured and thus a reset depends on the Host HTTP header.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-640 CWE-640

References

Other References

https://gist.github.com/BrookeYangRui/19fcc6c19df7bb4d8437476c609a6129 https://github.com/MaxHalford/flask-boilerplate/blob/a170e7cec605906801680567c4279b30ccd9630b/app/views/user.py#L103-L126

Frequently Asked Questions

What is CVE-2025-43931? +

flask-boilerplate through a170e7c allows account takeover via the password reset feature because SERVER_NAME is not configured and thus a reset depends on the Host HTTP header. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-43931? +

CVE-2025-43931 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

How do I check if I'm vulnerable to CVE-2025-43931? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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