Skip to content
CVE PROGRAM SOURCE RECORD7.2 High

CVE-2026-21873

Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

zauberzeug nicegui

  • >= 2.22.0, < 3.5.0affected

References