Hi, After further clarification we increased impact of a vulnerability reported to us and described as S2-055 to High. The vulnerability exists in a JSON Jackson library and it's registered under CVE-2017-7525. Please read the bulletin  and apply possible solutions. This vulnerability impacts anyone using the vulnerable Jackson JSON library (not only Struts users).
 https://cwiki.apache.org/confluence/display/WW/S2-055 Regards -- Łukasz + 48 606 323 122 http://www.lenart.org.pl/