Microsoft Visio 2003 SP3 2007 SP3, and 2010 SP1 allows remote attackers to read arbitrary files via an XML document containing an external entity declaration in conjunction with an entity reference, aka "XML External Entities Resolution Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16750
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-044