References for XXE
- https://media.blackhat.com/eu-13/briefings/Osipov/bh-eu-13-XML-data-osipov-wp.pdf
- https://shiftordie.de/blog/2017/02/18/smtp-over-xxe/
- https://web-in-security.blogspot.com/2016/03/xxe-cheat-sheet.html#dos
- https://www.acunetix.com/blog/articles/xml-external-entity-xxe-vulnerabilities/
- https://github.com/enjoiz/XXEinjector
- https://www.usenix.org/system/files/conference/woot16/woot16-paper-spath.pdf
- https://www.vsecurity.com/download/papers/XMLDTDEntityAttacks.pdf