Detections
Analytics
CVE-2026-21873
medium
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.
References
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr