Description
WordPress Plugin Art-Picture-Gallery is prone to a vulnerability that lets attackers upload arbitrary files because the application fails to properly verify user-supplied input. An attacker can exploit this vulnerability to upload arbitrary code and run it in the context of the webserver process. This may facilitate unauthorized access or privilege escalation; other attacks are also possible. WordPress Plugin Art-Picture-Gallery version 1.2.9 is vulnerable; prior versions may also be affected.
Remediation
Disable the plugin until a fix is available
References
http://www.vapidlabs.com/advisory.php?v=204
https://www.exploit-db.com/exploits/46182
https://wordpress.org/plugins/art-picture-gallery/#description