Cross-site scripting (XSS) vulnerability in pixabay-images.php in the Pixabay Images plugin before 2.4 for WordPress allows remote attackers to inject arbitrary web script or HTML via the image_user parameter.
https://www.mogwaisecurity.de/advisories/MSA-2015-01.txt
https://exchange.xforce.ibmcloud.com/vulnerabilities/100039
http://www.securityfocus.com/bid/73931
http://www.securityfocus.com/archive/1/534505/100/0/threaded
http://www.openwall.com/lists/oss-security/2015/01/25/5
http://www.exploit-db.com/exploits/35846