An issue was discovered in Biztalk360 before 11.5. Because of mishandling of user-provided input in an upload mechanism, an authenticated attacker is able to write files outside of the destination directory and/or coerce an authentication from the service, aka Directory Traversal.
https://www.synacktiv.com/en/advisories/remote-code-execution-from-any-domain-account-in-biztalk360