In a recent Product Security Review, Code White Researchers discovered a XXE vulnerability in Apache Flex BlazeDS/Adobe (see ASF Advisory). The vulnerable code can be found in the BlazeDS Remoting/AMF protocol implementation.
All versions before 4.7.1 are vulnerable. Software products providing BlazeDS Remoting destinations might be also affected by the vulnerability (e.g. Adobe LiveCycle Data Services, see APSB15-20).