SQL injection vulnerability in the Export CSV page in the Participants Database plugin before 1.5.4.9 for WordPress allows remote attackers to execute arbitrary SQL commands via the query parameter in an "output CSV" action to pdb-signup/.
https://www.yarubo.com/advisories/1
https://wordpress.org/plugins/participants-database/changelog
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-3894
http://www.securityfocus.com/bid/67769
http://www.exploit-db.com/exploits/33613