Hi, Well, this exploit has been commented out a few weeks ago, you can download Drupal 4.6.2 there http://drupal.org/drupal-4.6.2 it will prevent this bug
Regarding the datas from MySQL, I don't think there's any problem with it, but maybe someone can confirm. The exploit was made through XML-RPC file but I don't think any "corrupted data" should be inserted in DB.
Regards
Nicolas