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.

INFO

Published Date :

2026-01-08T09:50:23.361Z

Last Modified :

2026-01-08T15:11:24.092Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21873 vulnerability.

Vendors Products
Zauberzeug
  • Nicegui
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21873.

URL Resource
https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0 cve-icon cve-icon
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact