CVE-2026-21873

HIGH

7.2

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.

CVE Details

CVSS v3.1 Score7.2

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/8/2026

Last Modified1/15/2026

Sourcenvd

Honeypot Sightings0

Affected Products

zauberzeug:nicegui

Weaknesses (CWE)

CWE-79

References

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0(security-advisories@github.com)

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

IOC Correlations

No correlations recorded

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