CVE-2026-21873

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

6.1 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

January 08, 2026

Last Modified

January 15, 2026

CWE ID

CWE-79

Source

NVD

Vendor

zauberzeug

Product

nicegui

External References

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr

CVE-2026-21873

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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