PT-2026-2111 · Nicegui · Nicegui

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CVE-2026-21872

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Published

2026-01-08

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Updated

2026-07-07

CVSS v3.1

6.1

Medium

VectorAV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Name of the Vulnerable Software and Affected Versions NiceGUI versions 2.22.0 through 3.4.1
Description NiceGUI is a Python-based UI framework susceptible to a cross-site scripting (XSS) issue. The problem stems from an unsafe implementation within the click event listener used by ui.sub pages, coupled with the rendering of attacker-controlled links on the page. When a user clicks on such a link, XSS can occur. The issue involves the ui.sub pages function and the handling of links.
Recommendations Upgrade to NiceGUI version 3.5.0 or later.

Exploit

Fix

XSS

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Weakness Enumeration

Related Identifiers

CVE-2026-21872
GHSA-M7J5-RQ9J-6JJ9
PYSEC-2026-1701

Affected Products

Nicegui