pixabay-images.php in the Pixabay Images plugin before 2.4 for WordPress does not properly restrict access to the upload functionality, which allows remote attackers to write to arbitrary files.
packetstormsecurity.com/files/130017/WordPress-Pixarbay-Images-2.3-XSS-Bypass-Upload-Traversal.html
seclists.org/fulldisclosure/2015/Jan/75
www.exploit-db.com/exploits/35846
www.openwall.com/lists/oss-security/2015/01/25/5
www.osvdb.org/117146
www.securityfocus.com/archive/1/534505/100/0/threaded
plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&new=1067992%40pixabay-images%2Ftrunk%2Fpixabay-images.php&old=926633%40pixabay-images%2Ftrunk%2Fpixabay-images.php