The server in Adaptive Computing Moab before 7.2.9 and 8 before 8.0.0 does not properly validate the message owner matches the submitting user, which allows remote authenticated users to impersonate arbitrary users via the UserId and Owner tags.
https://exchange.xforce.ibmcloud.com/vulnerabilities/96698
http://www.securityfocus.com/bid/70174
http://www.securityfocus.com/archive/1/533576/100/0/threaded