cve.bz

CVE-2026-21872

6.1 mediumEPSS 0.3%

Medium (6.1) in zauberzeug nicegui. EPSS 0.3% chance of exploitation in the next 30 days. Fixed in nicegui 3.5.0.

NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the click event listener used by ui.sub_pages, combined with attacker-controlled link rendering on the page, causes XSS when the user actively clicks on the link. This issue has been patched in version 3.5.0.

Severity

CVSS 3.1

6.1 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 19% of CVEs (scores of 2026-10-31)
CWE
CWE-79
Published
Modified
Record from
the NVD, synced

Affected

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-m7j5-rq9j-6jj9PyPInicegui>=2.22.0 <3.5.03.5.0
PYSEC-2026-1701PyPInicegui>=2.22.0 <3.5.03.5.0

References

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