VDB-335084 · CVE-2025-66469 · GHSA-72qc-wxch-74mg

zauberzeug nicegui up to 3.3.x ui.add_css/ui.add_scss/ui.add_sass cross site scripting

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.1	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in zauberzeug nicegui up to 3.3.x. This affects the function ui.add_css/ui.add_scss/ui.add_sass. Such manipulation leads to cross site scripting. This vulnerability is traded as CVE-2025-66469. The attack may be launched remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in zauberzeug nicegui up to 3.3.x and classified as problematic. Affected by this issue is the function ui.add_css/ui.add_scss/ui.add_sass. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-66469 since 12/02/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 3.4.0 eliminates this vulnerability. Applying the patch a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202512-1077). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

zauberzeug

Name

nicegui

Version

License

open-source

Website

Product: https://github.com/zauberzeug/nicegui/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: nicegui 3.4.0
Patch: a8fd25b7d5e23afb1952d0f60a1940e18b5f1ca8

Timelineinfo

12/02/2025 CVE reserved
12/09/2025 +7 days Advisory disclosed
12/09/2025 +0 days VulDB entry created
12/10/2025 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-72qc-wxch-74mg
Status: Confirmed

CVE: CVE-2025-66469 (🔒)
GCVE (CVE): GCVE-0-2025-66469
GCVE (VulDB): GCVE-100-335084
CNNVD: CNNVD-202512-1077 - NiceGUI 跨站脚本漏洞

Entryinfo

Created: 12/09/2025 11:58
Updated: 12/10/2025 03:27
Changes: 12/09/2025 11:58 (67), 12/09/2025 12:36 (1), 12/10/2025 03:27 (6)
Complete: 🔍
Cache ID: 216::103