[VE][HTML5] Unescaped ampersand within img src tag

URL: http://codx.altervista.org/line: 131, column: 145    (for instance)Line contents:<img src="http://codx.altervista.org/scripts/php/image.php?img=/membri/codx/grafica/articles_covers/cover_t3dc1360866428.jpg&h=96" alt="Teeter 3D contesT" />Simply, that & does not have to be escaped to &amp;, it would produce errors. I'd like to add the "Valid HTML5" plate but this issue is really annoying.
Thank you for your attention.