CVE-2026-21872

MEDIUM

NiceGUI 2.22.0-3.4.1 - Stored Cross-Site Scripting via Sub-Page Click Event Listener

Title source: llm

Description

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.

References (2)

Core 2

Core References

Exploit, Vendor Advisory x_refsource_confirm

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9

Release Notes x_refsource_misc

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0

Scores

CVSS v3 6.1

EPSS 0.0002

EPSS Percentile 6.0%

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 2.22.0 - 3.5.0PyPI

zauberzeug/nicegui 2.22.0 - 3.5.0

Published Jan 08, 2026

Tracked Since Feb 18, 2026