Language: Go
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
func Markdown2HTML(source string) string {
	mdConverter := goldmark.New(
		goldmark.WithExtensions(&DangerousHTMLFilterExtension{}, extension.GFM),
		goldmark.WithParserOptions(
			parser.WithAutoHeadingID(),
		),
		goldmark.WithRendererOptions(
			goldmarkHTML.WithHardWraps(),
		),
	)
	var buf bytes.Buffer
	if err := mdConverter.Convert([]byte(source), &buf); err != nil {
		log.Error(err)
		return source
	}
	return buf.String()
}