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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Lifecycle Timeline
3Blast Radius
ecosystem impact- 1 pypi packages depend on nicegui (1 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. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 6.1 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …
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