What is CVE-2026-27156?

CVE-2026-27156 is a medium-severity vulnerability in Zauberzeug Nicegui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-24.

How severe is CVE-2026-27156?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Zauberzeug Nicegui

CVE-2026-27156

NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements (`Element.run_method()`, `AgGrid.run_grid_method()`, `EChart.run_chart_method()`, and others) use an `eval()`…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (14.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Zauberzeug Nicegui — versions < 3.8.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-78qv-3mpx-9cqq (x_refsource_CONFIRM)
https://github.com/zauberzeug/nicegui/commit/1861f59cc374ca0dc9d970b157ef3774720f8dbf (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-27156?: CVE-2026-27156 is a medium-severity vulnerability in Zauberzeug Nicegui, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-24.
How severe is CVE-2026-27156?: Medium severity. CVSS v3 base score is 6.1 out of 10.