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.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-m7j5-rq9j-6jj9 NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 16 Jan 2026 02:45:00 +0900

Type Values Removed Values Added
CPEs cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*

Fri, 09 Jan 2026 22:30:00 +0900

Type Values Removed Values Added
First Time appeared Zauberzeug
Zauberzeug nicegui
Vendors & Products Zauberzeug
Zauberzeug nicegui

Fri, 09 Jan 2026 03:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 08 Jan 2026 19:00:00 +0900

Type Values Removed Values Added
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.
Title NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-08T15:13:11.652Z

Reserved: 2026-01-05T16:44:16.369Z

Link: CVE-2026-21872

cve-icon Vulnrichment

Updated: 2026-01-08T15:13:00.614Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-08T10:15:55.470

Modified: 2026-01-15T17:41:02.210

Link: CVE-2026-21872

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-09T22:25:38Z

Weaknesses