The Web Gateway component in IBM WebSphere MQ File Transfer Edition 7.0.4 and earlier allows remote authenticated users to read files of arbitrary users via vectors involving a username in a URI, as demonstrated by a modified metadata=fteSamplesUser field to the /transfer URI.
IBM WebSphere MQ 7.0.1 before 7.0.1.13, 7.1 before 7.1.0.6, 7.5 before 7.5.0.5, and 8 before 8.0.0.1 allows remote authenticated users to cause a denial of service (queue-slot exhaustion) by leveraging PCF query privileges for a crafted query.