cvedb.io
CVE-2026-21871
MEDIUM · CVSS 6.1
EPSS exploitation probability: 0%
Published 2026-01-08T10:15:55.300 · Last modified 2026-06-17T10:19:03.873

Summary

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 without page reload. However, if the URL argument is embedded into generated JavaScript without proper escaping, a crafted payload can break out of the intended string context and execute arbitrary JavaScript in the victim’s browser. Applications that do not pass untrusted input into ui.navigate.history.push/replace are not affected. This issue has been patched in version 3.5.0.

Affected products

zauberzeug — nicegui

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.