The REST plugin in Apache Struts 2 2.3.19 through 2.3.28.1 allows remote attackers to execute arbitrary code via a crafted expression.
jvn.jp/en/jp/JVN07710476/index.html
jvndb.jvn.jp/jvndb/JVNDB-2016-000110
bugzilla.redhat.com/show_bug.cgi?id=1348238
github.com/apache/struts
github.com/apache/struts/commit/6d7ac40dcede1793a4534a3dc249fd562d495e8c
github.com/apache/struts/commit/76eb8f38a33ad0f1f48464ee1311559c8d52dd6d
github.com/apache/struts/commit/c9c21378f2fb2ff21355c128c45e106ebd87ad7c
github.com/apache/struts/commit/deefeffd11425f0cd0b797cd86a9b3550234262b
nvd.nist.gov/vuln/detail/CVE-2016-4438
struts.apache.org/docs/s2-037.html