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CVE-2026-27156— NiceGUI has XSS via Code Injection

Quick assessment

Affected
zauberzeug nicegui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI 3.8.0之前版本存在跨站脚本漏洞，该漏洞源于多个客户端API使用eval回退且方法名未正确转义，可能导致攻击者在受害者浏览器中执行任意JavaScript代码。

CVSS 6.1 · Medium EPSS 0.16% · P6
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I. Basic Information for CVE-2026-27156

Vulnerability Information
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Vulnerability Title
NiceGUI has XSS via Code Injection
Source: CVE Program / CVE List V5
Vulnerability Description
NiceGUI is a Python-based UI framework. Prior to version 3.8.0, several NiceGUI APIs that execute methods on client-side elements (`Element.run_method()`, `AgGrid.run_grid_method()`, `EChart.run_chart_method()`, and others) use an `eval()` fallback in the JavaScript-side `runMethod()` function. When user-controlled input is passed as the method name, an attacker can inject arbitrary JavaScript that executes in the victim's browser. Additionally, `Element.run_method()` and `Element.get_computed_prop()` used string interpolation instead of `json.dumps()` for the method/property name, allowing quote injection to break out of the intended string context. Version 3.8.0 contains a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
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 3.8.0之前版本存在跨站脚本漏洞，该漏洞源于多个客户端API使用eval回退且方法名未正确转义，可能导致攻击者在受害者浏览器中执行任意JavaScript代码。
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

Vendor Product Affected Versions CPE Subscribe
zauberzeug nicegui < 3.8.0 -

II. Public POCs for CVE-2026-27156

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III. Intelligence Information for CVE-2026-27156

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Vendor Advisories for CVE-2026-27156 (1)

IV. Related Vulnerabilities

Same product: nicegui
Same vendor: zauberzeug
Same weakness: CWE-79

V. Comments for CVE-2026-27156

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