A flaw within a side query that is used in the search UI has recently been discovered that affects all versions of vBulletin 4 Forum Classic and vBulletin 4 Publishing Suite. This flaw may enable malicious individuals to inject sql that would allow you to run arbitrary queries on the db via this exploit. This is a new exploit and while similar, unrelated to one previously rectified in April. To resolve this issue, it has been necessary to release a patch level version on all versions of vBulletin 4.X. The issue does not affect vBulletin 3.X to the best of our knowledge.