websense offers this graph of the recent “timthumb” security issue. I have certainly had my hands full tracking this bugger down and cleaning it up. This is a good argument for managed WordPress hosting where an expert keeps an eye on these issues for you.
Read more about how to fix this issue at wpcandy. I found that many themes use the filename “thumb.php” so watch for that.
Note: you MUST delete timthumb or upgrade timthumb ASAP. AND you should still scan your files AND change your passwords. More helpful links:
- TimThumb 0-day vulnerability
- Affected themes
- SuperDomain information
- SuperDomain followup
- You can scan your site, free, at http://sitecheck.sucuri.net/scanner (It is safe to check, but I think this will only check if your site has been hacked – not if this vulnerability is there)