NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.add_css, ui.add_scss, and ui.add_sass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended <style> or <script> tags by injecting closing tags (e.g., </style> or </script>), allowing for the execution of arbitrary JavaScript. This issue is fixed in version 3.4.0.
References
| Link | Resource |
|---|---|
| https://github.com/zauberzeug/nicegui/commit/a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8 | Patch |
| https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg | Exploit Vendor Advisory |
| https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg | Exploit Vendor Advisory |
Configurations
History
11 Dec 2025, 16:00
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/zauberzeug/nicegui/commit/a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8 - Patch | |
| References | () https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg - Exploit, Vendor Advisory | |
| First Time |
Zauberzeug
Zauberzeug nicegui |
|
| CPE | cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:* |
09 Dec 2025, 16:18
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/zauberzeug/nicegui/security/advisories/GHSA-72qc-wxch-74mg - |
09 Dec 2025, 00:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-12-09 00:15
Updated : 2025-12-11 16:00
NVD link : CVE-2025-66469
Mitre link : CVE-2025-66469
CVE.ORG link : CVE-2025-66469
JSON object : View
Products Affected
zauberzeug
- nicegui
CWE
CWE-79
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')