Is nicegui affected by CVE-2026-21873?

PyPI nicegui is affected in >=2.22.0 <3.5.0.

Is CVE-2026-21873 being exploited?

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

high

CVE-2026-21873

Q: Is CVE-2026-21873 being exploited?

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

PyPI · nicegui

Summary

NiceGUI apps which use `ui.sub_pages` vulnerable to zero-click XSS

Severity: high
EPSS: 0.2% (p14)
Also known as: GHSA-mhpg-c27v-6mxr
Published: 2026-01-08

References

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mhpg-c27v-6mxr
https://nvd.nist.gov/vuln/detail/CVE-2026-21873
https://github.com/zauberzeug/nicegui

Related advisories

CVE-2026-45553 — high · PyPI/nicegui
CVE-2026-25732 — 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
CVE-2026-33332 — 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.