Python
CVE-2026-27156
MEDIUM
GHSA-78qv-3mpx-9cqq
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3Blast Radius
ecosystem impact- 2 pypi packages depend on nicegui (2 direct, 0 indirect)
Ecosystem-wide dependent count for version 3.8.0.
DescriptionGitHub Advisory
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.
AnalysisAI
NiceGUI versions prior to 3.8.0 are vulnerable to stored cross-site scripting (XSS) through multiple APIs that improperly handle user-controlled method names, allowing attackers to inject arbitrary JavaScript that executes in victims' browsers. The vulnerability stems from unsafe use of eval() and string interpolation in Element.run_method(), AgGrid.run_grid_method(), EChart.run_chart_method(), and related functions. A patch is available in version 3.8.0 and later.
Technical ContextAI
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Nicegui. 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_p
RemediationAI
A vendor patch is available — apply it immediately. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
Leaving vuln.today