Description
WordPress Plugin Advanced Custom Fields is prone to a remote file include vulnerability because it fails to sufficiently sanitize user-supplied input. Exploiting this issue may allow an attacker to compromise the application and the underlying system; other attacks are also possible. WordPress Plugin Advanced Custom Fields version 3.5.1 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 3.5.2 or latest
References
http://www.securityfocus.com/bid/56528/exploit
http://ceriksen.com/2012/11/14/wordpress-advanced-custom-fields-remote-file-inclusion-vulnerability/