Apache Struts 2.x before 2.3.20.3, 2.3.24.3, and 2.3.28 allows remote attackers to execute arbitrary code via a %{}
sequence in a tag attribute, aka forced double OGNL evaluation.
struts.apache.org/docs/s2-029.html
github.com/apache/struts
github.com/apache/struts/commit/15857a69e7baf3675804495a5954cd0756ac8364
nvd.nist.gov/vuln/detail/CVE-2016-0785
web.archive.org/web/20210123095715/www.securityfocus.com/bid/85066
web.archive.org/web/20220118185853/www.securitytracker.com/id/1035271