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OpenAdvisories
High · 7.2 CVE-2026-21873 EUVD-2026-1475GHSA-mhpg-c27v-6mxrPYSEC-2026-1702

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

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 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

VendorProductAffectedFixed
zauberzeug nicegui >= 2.22.0, < 3.5.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI nicegui >= 2.22.0, < 3.5.0 3.5.0 GHSA-mhpg-c27v-6mxr

References