CVE-2025-53354: medium-severity vulnerability in zauberzeug nicegui
NiceGUI is vulnerable to Reflected XSS attack
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.2%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
zauberzeug · niceguiRelated CVEs — zauberzeug nicegui
In the same product, most dangerous first.
CVE-2026-25732HIGHNiceGUI's Path Traversal via Unsanitized FileUpload.name Enables Arbitrary File WriteEPSS 3.4%CVE-2025-66645HIGHNiceGUI Path Traversal Vulnerability in app.add_media_files() Allows Arbitrary File ReadingEPSS 1.2%CVE-2024-32005HIGHLocal File Inclusion in NiceGUI leaflet componentEPSS 0.8%CVE-2026-33332MEDIUMNiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustionEPSS 0.6%CVE-2026-21874MEDIUMNiceGUI has Redis connection leak via tab storage causes service degradationEPSS 0.6%CVE-2025-21618HIGHNiceGUI On Air authentication issueEPSS 0.4%