CVE-2026-21873

Published: Jan 8, 2026Modified: Jun 17, 2026

6.1

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitability: 2.8 / Impact: 2.7

Source: NVD

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 (1)

Products: Zauberzeug: Nicegui

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Zauberzeug Nicegui	From 2.22.0 to 3.5.0

Related CWEs

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (2)

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0

Source: security-advisories@github.com

Release Notes

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr

Source: security-advisories@github.com

ExploitVendor Advisory

Timeline

No history available yet.