CVE-2025-53354 - CVE House

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Status published Medium CVE-2025-53354

NiceGUI is vulnerable to Reflected XSS attack

6.1 CVSS

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from zauberzeug

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NiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File Reading

NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content

NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection

NiceGUI On Air authentication issue

Local File Inclusion in NiceGUI leaflet component

Affected Vendor

zauberzeug

View all reports →

Affected Software

nicegui

Vulnerable Versions:

< 3.0.0

Timeline

Official Publish: October 3rd, 2025

Last Modified: October 3rd, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

T1059.007 JavaScript

T1539 Steal Web Session Cookie

T1213 Data from Information Repositories

T1567 Exfiltration Over Web Service

T1491.001 Defacement