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OpenAdvisories
Medium · 6.1 CVE-2026-21872 EUVD-2026-1477GHSA-m7j5-rq9j-6jj9PYSEC-2026-1701

NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links

Published Jan 8, 2026 · Updated Jan 8, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
zauberzeug nicegui >= 2.22.0, < 3.5.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI nicegui >= 2.22.0, < 3.5.0 3.5.0 GHSA-m7j5-rq9j-6jj9

References