The W3 Total Cache plugin before 0.9.4.1 for WordPress does not properly handle empty nonces, which allows remote attackers to conduct cross-site request forgery (CSRF) attacks and hijack the authentication of administrators for requests that change the mobile site redirect URI via the mobile_groups[*][redirect] parameter and an empty _wpnonce parameter in the w3tc_mobile page to wp-admin/admin.php.
https://wordpress.org/plugins/w3-total-cache/changelog/
https://exchange.xforce.ibmcloud.com/vulnerabilities/99352
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-9235
http://www.securityfocus.com/archive/1/534250/100/0/threaded
http://secunia.com/advisories/61562
http://seclists.org/fulldisclosure/2014/Dec/67
http://packetstormsecurity.com/files/129512/W3-Total-Cache-0.9.4-Cross-Site-Request-Forgery.html
http://mazinahmed1.blogspot.com/2014/12/w3-total-caches-w3totalfail.html