CVE-2026-27156
MEDIUM
GHSA-78qv-3mpx-9cqq
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Description
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.
Analysis
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. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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