What is CVE-2025-21618?

CVE-2025-21618 is a high-severity vulnerability in Zauberzeug Nicegui, classified under Improper Authentication. CVSS score: 7.5/10. Published 2025-01-06.

How severe is CVE-2025-21618?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Zauberzeug Nicegui

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.

Vulnerability class: Broken Authentication

EPSS: 0.002 (38.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Zauberzeug Nicegui — versions < 2.9.1

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

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

Frequently asked questions

What is CVE-2025-21618?: CVE-2025-21618 is a high-severity vulnerability in Zauberzeug Nicegui, classified under Improper Authentication. CVSS score: 7.5/10. Published 2025-01-06.
How severe is CVE-2025-21618?: High severity. CVSS v3 base score is 7.5 out of 10.