Adaptive Computing Moab before 7.2.9 and 8 before 8.0.0, when a pre-generated key is used, does not validate that the requesting user matches the actor in the message, which allows remote authenticated users to impersonate arbitrary users via the actor field in a message.
Moab suffers from an insecure message signing authentication bypass vulnerability. All versions up to 8 can be affected depending on the configuration.