CVE-2025-21618: Auth Bypass (CVSS 7.5)

Description

NiceGUI is an easy-to-use, Python-based UI framework. Prior to 2.9.1, authenticating with NiceGUI logged in the user for all browsers, including browsers in incognito mode. This vulnerability is fixed in 2.9.1.

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-287 Improper Authentication

References

Other References

https://github.com/zauberzeug/nicegui/commit/1621a4ba6a06676b8094362d36623551e651adc1 https://github.com/zauberzeug/nicegui/security/advisories/GHSA-v6jv-p6r8-j78w

Frequently Asked Questions

What is CVE-2025-21618? +

NiceGUI is an easy-to-use, Python-based UI framework. Prior to 2.9.1, authenticating with NiceGUI logged in the user for all browsers, including browsers in incognito mode. This vulnerability is fixed in 2.9.1. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-21618? +

CVE-2025-21618 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-21618? +

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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