Description
NiceGUI is a Python-based UI framework. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-8c95-hpq2-w46f
Scores
CVSS v3
6.1
EPSS
0.0003
EPSS Percentile
7.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
pypi/nicegui
0 - 3.0.0PyPI
zauberzeug/nicegui
< 3.0.0
Published
Oct 03, 2025
Tracked Since
Feb 18, 2026