CVE-2026-21872

NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links

CVSS 6.1 MEDIUMEPSS 0.2%CWE-79

Vexday Risk Score

13Bajo

Decisión SSVC (CISA)

Track

Sin señal de explotación → monitorear

CVSS 6.1EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Ciclo de vida

08 ene 2026Publicada en NVD

Recomendación: Monitorear — sin señal de explotación por ahora.

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.

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

Productos afectados

zauberzeug · nicegui

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Referencias

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0 https://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9