CVE-2026-21873
HIGHNiceGUI 2.22.0-3.4.1 - Cross-Site Scripting via Pushstate Event Listener
Title source: llmDescription
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 (2)
Core 2
Core References
Exploit, Vendor Advisory x_refsource_confirm
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr
Release Notes x_refsource_misc
https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0
Scores
CVSS v3
7.2
EPSS
0.0002
EPSS Percentile
6.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-79
Status
published
Products (2)
pypi/nicegui
2.22.0 - 3.5.0PyPI
zauberzeug/nicegui
2.22.0 - 3.5.0
Published
Jan 08, 2026
Tracked Since
Feb 18, 2026