New kind of graffiti

This morning I visited the site where my novel (Return by John Durham) is displayed for sale Return by John Durham, to see the site visit/sales tracking information. I had to log in. To my dismay in the comments area I found the kind of thing you usually get in unsolicited emails. How did it get there?

Only one way- A professional spammer with membership access must have visited the area to leave a whole lot of meaningless characters behind. The author quietly tears hair out while the helpful people at lulu.com investigate.

Postscript:This morning I checked the site. It appears that lulu.com have repaired a problem with the site. Things look normal once more (good job, lulu!)