Reflected Cross-Site Scripting (XSS)

NiceGUI is vulnerable to Reflected Cross-Site Scripting XSS. The vulnerability is due to improper sanitization or encoding in the ui.addcss, ui.addscss, and ui.addsass functions, which allows an attacker to inject closing tags and execute arbitrary JavaScript...

CVE-2025-66469

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.addcss, ui.addscss, and ui.addsass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended or...

CVE-2025-66469 NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.addcss, ui.addscss, and ui.addsass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended or...

CVE-2025-66469 NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.addcss, ui.addscss, and ui.addsass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended or...

CVE-2025-66469 NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to Reflected XSS through its ui.addcss, ui.addscss, and ui.addsass functions. The functions lack proper sanitization or encoding for the JavaScript context they generate. An attacker can break out of the intended or...

CVE-2025-66469

CVE-2025-66469 is a reported Reflected XSS in NiceGUI (Python UI framework). The vulnerability affects versions 3.3.1 and earlier and stems from insufficient sanitization/escaping in the functions ui.add_css, ui.add_scss, and ui.add_sass, which generate JavaScript contexts that can be broken out ...

GHSA-72QC-WXCH-74MG NiceGUI Reflected XSS in ui.add_css, ui.add_scss, and ui.add_sass via Style Injection

Summary A Cross-Site Scripting XSS vulnerability exists in ui.addcss, ui.addscss, and ui.addsass functions in NiceGUI v3.3.1 and earlier. These functions allow developers to inject styles dynamically. However, they lack proper sanitization or encoding for the JavaScript context they generate. An...