Etherpad has stored XSS in HTML export via unescaped attribute-pool values

Fix: PR 7905 ether/etherpad. getHTMLFromAtext in src/node/utils/ExportHtml.ts interpolates values from the exportHtmlAdditionalTagsWithData plugin hook into span data-="" without HTML-attribute escaping. The value comes verbatim from the pad attribute pool, which a pad editor controls via a craft...