CVE-2026-25516

NiceGUI is a Python-based UI framework. The ui.markdown component uses the markdown2 library to convert markdown content to HTML, which is then rendered via innerHTML. By default, markdown2 allows raw HTML to pass through unchanged. This means that if an application renders user-controlled conten...

NiceGUI cross-site scripting vulnerability

NiceGUI is an easy-to-use, Python-based UI framework developed under the open source license. Versions of NiceGUI prior to 3.7.0 contained a cross-site scripting vulnerability. This vulnerability stemmed from the ui.markdown component, which allowed raw HTML to be passed through by default,...

CVE-2026-25516: Improper Neutralization of Input During Web Page Generation

NiceGUI is a Python-based UI framework. The ui.markdown component uses the markdown2 library to convert markdown content to HTML, which is then rendered via innerHTML. By default, markdown2 allows raw HTML to pass through unchanged. This means that if an application renders user-controlled conten...

NiceGUI's XSS vulnerability in ui.markdown() allows arbitrary JavaScript execution through unsanitized HTML content

Description The ui.markdown component uses the markdown2 library to convert markdown content to HTML, which is then rendered via innerHTML. By default, markdown2 allows raw HTML to pass through unchanged. This means that if an application renders user-controlled content through ui.markdown, an...