TI-2025-33319 Aliases CVE-2025-53354 GHSA-8c95-hpq2-w46f

NiceGUI is vulnerable to Reflected XSS attack

MEDIUM 60CWE-79Published 2025-10-03 · Updated 2025-10-03

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. Versions 2.24.2 and below are at risk for Cross-Site Scripting (XSS) when developers render unescaped user input into the DOM using ui.html(). NiceGUI did not enforce HTML or JavaScript sanitization, so applications that directly combine components like ui.input() with ui.html() or ui.chat_message with HTML content without escaping may allow attackers to execute arbitrary JavaScript in the user’s browser. Applications that do not pass untrusted input into ui.html() are not affected. This issue is fixed in version 3.0.0.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00204 10th percentileScored 2026-11-07

Fix Fixed nicegui (zauberzeug): 3.0.0nicegui (PyPI): 3.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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 3.0.0	3.0.0	Patch available	CNA
—	nicegui (PyPI)	before 3.0.0	3.0.0	Patch available	GHSA-8c95-hpq2-w46f

nicegui Vendorzauberzeug Affected before 3.0.0 Fixed in 3.0.0 Patch available CNA
nicegui (PyPI) Vendor— Affected before 3.0.0 Fixed in 3.0.0 Patch available GHSA-8c95-hpq2-w46f

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:zauberzeug:nicegui::::::::	—	—	zauberzeug

cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* Versions — — ·zauberzeug

Remediation

Fix · CNA nicegui (zauberzeug) Fixed in 3.0.0
Fix · GHSA-8c95-hpq2-w46f nicegui (PyPI) Fixed in 3.0.0 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2025-53354
2026-10-03 Alias added: GHSA-8c95-hpq2-w46f

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2025-53354

Other 3

TI-2024-21104 Local File Inclusion in NiceGUI leaflet component CVSS 3.1HIGH 8.2
TI-2025-41029 NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading CVSS 3.1HIGH 7.5
TI-2025-15578 NiceGUI On Air authentication issue 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

See all 16 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences