Apache Struts could allow a remote attacker to execute arbitrary code on the system, caused by a forced double OGNL evaluation on raw user input in tag attributes. By sending specially crafted data, an attacker could exploit this vulnerability to execute arbitrary code on the system.
Apache Struts is vulnerable to a denial of service, caused by an access permission override when performing a file upload. By sending a specially crafted request, an attacker could exploit this vulnerability to cause subsequent upload actions to fail.
Refer to Apache Struts 2 Documentation S2-060 for patch, upgrade or suggested workaround information.