Sammy Forgit has reported a vulnerability in the Sitemile Auctions Plugin for WordPress, which can be exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to the wp-content/plugins/auctionPlugin/upload.php script allowing the upload of files with arbitrary extensions to a folder inside the webroot. This can be exploited to execute arbitrary PHP code by uploading a malicious PHP script.
The vulnerability is reported in version 2.0.1.3. Other versions may also be affected.