As Modwest hosting supports WordPress installs, we wanted to make you aware of a timthumb.php vulnerability that affects both themes and plug-ins which utilize the timthumb.php script. The vulnerability lies in a coding error that allows would-be attackers to backdoor malicious .php scripts while masquerading them as benign thumbnails.
According to articles I read, the original blog about this issue was posted on August 3, 2011 at ++Zen Blog. Here's an up-to-date list from Sucuri Research Blog (August 17, 2011) of plug-ins and themes being scanned by attackers.
If you utilize these products, mimize the risk of being exploited by acting promptly.