It was reported that python-bleach, a whitelist-based HTML-sanitizing library, is prone to a mutation XSS vulnerability in bleach.clean when "svg" or "math" are in the allowed tags, "p" or "br" are in allowed tags, "style", "title", "noscript", "script", "textarea", "noframes", "iframe", or "xmp" are in allowed tags and "strip_comments=False" is set.