CVE-2026-21871

NiceGUI is a Python-based UI framework. From versions 2.13.0 to 3.4.1, there is a XSS risk in NiceGUI when developers pass attacker-controlled strings into ui.navigate.history.push or ui.navigate.history.replace. These helpers are documented as History API wrappers for updating the browser URL...

NiceGUI cross-site scripting vulnerability

NiceGUI is NiceGUI open source an easy to use, Python based UI framework. A cross-site scripting vulnerability exists in NiceGUI versions 2.13.0 through 3.4.1, which stems from a cross-site scripting risk in the ui.navigate.history.push or replace function...