TI-2026-21605 Aliases CVE-2026-27156 GHSA-78qv-3mpx-9cqq

NiceGUI has XSS via Code Injection

LOW 27CWE-79Published 2026-02-24 · Updated 2026-02-26

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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()` fallback in the JavaScript-side `runMethod()` function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, `Element.run_method()` and `Element.get_computed_prop()` used string interpolation instead of `json.dumps()` for the method/property name, allowing quote injection to break out of the intended string context. Version 3.8.0 contains a fix.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00196 9th percentileScored 2026-11-07

Fix Fixed nicegui (zauberzeug): 3.8.0nicegui (PyPI): 3.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
zauberzeug	nicegui	before 3.8.0	3.8.0	Patch available	CNA
—	nicegui (PyPI)	before 3.8.0	3.8.0	Patch available	GHSA-78qv-3mpx-9cqq

nicegui Vendorzauberzeug Affected before 3.8.0 Fixed in 3.8.0 Patch available CNA
nicegui (PyPI) Vendor— Affected before 3.8.0 Fixed in 3.8.0 Patch available GHSA-78qv-3mpx-9cqq

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zauberzeug:nicegui::::::::	before 3.8.0	Vulnerable	zauberzeug

cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* Versions before 3.8.0 Vulnerable ·zauberzeug

Remediation

Fix · CNA nicegui (zauberzeug) Fixed in 3.8.0
Fix · GHSA-78qv-3mpx-9cqq nicegui (PyPI) Fixed in 3.8.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-27156
2026-10-03 Alias added: GHSA-78qv-3mpx-9cqq

References

Patch 1

https://github.com/zauberzeug/nicegui/commit/1861f59cc374ca0dc9d970b157ef3774720f8dbf

Advisory 2

Other 1

https://github.com/zauberzeug/nicegui

TI-2025-41029 NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading CVSS 3.1HIGH 7.5
TI-2026-17574 Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages` CVSS 3.1HIGH 7.2
TI-2026-17575 NiceGUI has Redis connection leak via tab storage causes service degradation CVSS 3.1MEDIUM 5.3
TI-2026-17573 NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-provided links CVSS 3.1MEDIUM 6.1
TI-2026-17572 NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace() CVSS 3.1MEDIUM 6.1
TI-2025-40897 NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content CVSS 3.1MEDIUM 6.1

See all 11 →

Sources

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