mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection (XXE) vulnerability, as demonstrated by Autodiscover/Autodiscover.xml.
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
https://bugzilla.zimbra.com/show_bug.cgi?id=109129
http://www.rapid7.com/db/modules/exploit/linux/http/zimbra_xxe_rce