Is nicegui affected by CVE-2026-21872?

PyPI nicegui is affected in >=2.22.0 <3.5.0.

Is CVE-2026-21872 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

medium

CVE-2026-21872

Q: Is CVE-2026-21872 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

PyPI · nicegui

Summary

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

Severity: medium
EPSS: 0.2% (p15)
Also known as: GHSA-m7j5-rq9j-6jj9
Published: 2026-01-08

References

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-m7j5-rq9j-6jj9
https://nvd.nist.gov/vuln/detail/CVE-2026-21872
https://github.com/zauberzeug/nicegui

Related advisories

CVE-2026-45553 — high · PyPI/nicegui
CVE-2026-25732 — high · PyPI/nicegui
CVE-2026-21873 — high · PyPI/nicegui
CVE-2025-66645 — high · PyPI/nicegui
CVE-2025-21618 — high · PyPI/nicegui
CVE-2026-45554 — medium · PyPI/nicegui
MAL-2026-3180 — medium · npm/nicegui
CVE-2026-39844 — medium · PyPI/nicegui

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.