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I. Basic Information for CVE-2026-21873
Vulnerability Information

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Vulnerability Title
Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`
Source: NVD (National Vulnerability Database)
Vulnerability Description
NiceGUI is a Python-based UI framework. From versions 2.22.0 to 3.4.1, an unsafe implementation in the pushstate event listener used by ui.sub_pages allows an attacker to manipulate the fragment identifier of the URL, which they can do despite being cross-site, using an iframe. This issue has been patched in version 3.5.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: NVD (National Vulnerability Database)
Vulnerability Title
NiceGUI 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI 2.22.0版本至3.4.1版本存在跨站脚本漏洞,该漏洞源于pushstate事件监听器实现不安全,可能导致URL片段标识符被操纵。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
zauberzeugnicegui >= 2.22.0, < 3.5.0 -
II. Public POCs for CVE-2026-21873
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III. Intelligence Information for CVE-2026-21873
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IV. Related Vulnerabilities
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