CVE-2026-21873

Published January 8th, 2026

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CVSS v3

7.2

HIGH

CVSS v2

N/A

Affected

PROJECT

Description

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0.

zauberzeug/nicegui

Create web-based user interfaces with Python. The nice way.

GitHub

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