Tony Hung of Deep Jive Interests has made some very interesting discoveries this Sunday night.
Here’s the high-level issue:
Some enterprising hackers have put together a scheme whereby they hack a number of blogs, so that they can create their own network pages and links back to a few select blogs, to pages that are not easily visible. It takes advantage of the organic and real page rank of all of the sites in question, and probably makes some bucks for the hacker involved.
Why is this bad for *you*?
Other than the knowledge that someone is profiting off of your back, what can happen is that if you’re running Adsense, Google might notice all the hidden text and penalize you and pull you right out of the Index.
It’s unclear right now what exactly is going on — for example, whether this is a possible WordPress exploit, or something at the webhost level — but if you have a WordPress blog, please click through to Tony’s article and do a little checking to make sure your blog is not one of the affected.
UPDATE April 8: More on this. Upgrade now!
…if you are running any version of WordPress older than 2.3.3, you need to upgrade now. Seriously. WordPress 2.3.2 and older have security holes that are being actively exploited by hackers to inject spam links into blogs which are not maintained.