CVE-2026-21873

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.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-08 | Updated 2026-01-08 | Assigner GitHub_M

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

References

github.com/...icegui/security/advisories/GHSA-mhpg-c27v-6mxr

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

cve.org (CVE-2026-21873)

nvd.nist.gov (CVE-2026-21873)

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