LibreOffice before 5.4.5 and 6.x before 6.0.1 allows remote attackers to read arbitrary files via =WEBSERVICE calls in a document, which use the COM.MICROSOFT.WEBSERVICE function.
access.redhat.com/errata/RHSA-2018:0418
access.redhat.com/errata/RHSA-2018:0517
cgit.freedesktop.org/libreoffice/core/commit/?h=libreoffice-5-4-5&id=a916fc0c0e0e8b10cb4158fa0fa173fe205d434a
github.com/jollheef/libreoffice-remote-arbitrary-file-disclosure
usn.ubuntu.com/3579-1/
www.debian.org/security/2018/dsa-4111
www.exploit-db.com/exploits/44022/
www.libreoffice.org/about-us/security/advisories/cve-2018-1055/