Jaimie Sirovich of SEO Egghead has reported that his blog was attacked by spam is claiming that it is due to an an HTML insertion vulnerability which affects WP 2.3 and the latest version 2.3.1. Unfortunately, he has not provided any further details, so we cannot look into this further.

When we do a Google search for the Ads he mentioned we only get his blog come back:

Try1 : http://www.google.co.uk/search?
q=intext:adshelper.com&hl=en&start=0&sa=N
Try 2: http://www.google.co.uk/search?hl=en&
q=intext%3Awww.my-movie-download.com&btnG=Search&meta=

Only his blog shows up here, however, he has mentioned that other blogs are affected?

If anyone has more details on this please let us know so we can investigate further but at the moment this looks like an isolated incident to me.