What is CVE-2025-66469?

CVE-2025-66469 is a medium-severity vulnerability in Zauberzeug Nicegui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-12-08.

How severe is CVE-2025-66469?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Zauberzeug Nicegui

CVE-2025-66469

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.add_css, ui.add_scss, and ui.add_sass functions. The functions lack proper sanitization or encoding for the JavaScript context…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (13.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Zauberzeug Nicegui — versions < 3.4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg (x_refsource_CONFIRM)
https://github.com/zauberzeug/nicegui/commit/a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66469?: CVE-2025-66469 is a medium-severity vulnerability in Zauberzeug Nicegui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-12-08.
How severe is CVE-2025-66469?: Medium severity. CVSS v3 base score is 6.1 out of 10.