The MultiPageValidator implementation in Apache Struts 1 1.1 through 1.3.10 allows remote attackers to bypass intended access restrictions via a modified page parameter.
https://security.netapp.com/advisory/ntap-20180629-0006/
https://en.osdn.jp/projects/terasoluna/wiki/StrutsPatch2-EN
http://www.securityfocus.com/bid/74423
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.debian.org/security/2016/dsa-3536