In Apache Struts 2.3.x before 2.3.31, and 2.5.x before 2.5.5, it is possible to prepare a special URL which will be used for path traversal and execution of arbitrary code on server side. This vulnerability is only exploitable when using the Struts 2 Convention plugin in conjunction with Apache Struts.
github.com/apache/struts
github.com/apache/struts/commit/8e67b9144aa643769b261e2492cb561e04d016ab
github.com/apache/struts/commit/c1869f4989942dd33fa4e189e0ac1f766fb5ac14
nvd.nist.gov/vuln/detail/CVE-2016-6795
security.netapp.com/advisory/ntap-20180629-0003
struts.apache.org/docs/s2-042.html
web.archive.org/web/20200227214705/www.securityfocus.com/bid/93773