Apache Struts 2 2.3.20 through 2.3.28.1 allows remote attackers to bypass intended access restrictions and conduct redirection attacks by leveraging a default method.
jvn.jp/en/jp/JVN45093481/index.html
jvndb.jvn.jp/jvndb/JVNDB-2016-000113
www-01.ibm.com/support/docview.wss?uid=ssg1S1009282
www-01.ibm.com/support/docview.wss?uid=swg21987854
www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
bugzilla.redhat.com/show_bug.cgi?id=1348252
github.com/apache/struts
github.com/apache/struts/commit/eccc31ebce5430f9e91b9684c63eaaf885e603f9
nvd.nist.gov/vuln/detail/CVE-2016-4431
struts.apache.org/docs/s2-040.html
web.archive.org/web/20210123145002/www.securityfocus.com/bid/91284