GHSA-VXWR-WPJV-QJQ7 XWiki Platform: Privilege escalation (PR) from user registration through PDFClass

Impact Remote code execution is possible via PDF export templates. To reproduce on an installation, register a new user account with username PDFClass if XWiki.PDFClass does not exist. On XWiki.PDFClass, use the class editor to add a "style" property of type "TextArea" and content type "Plain...