4.0.6PL1 for Forum only
 

Thanks to user "Sir Nick" for reporting the following issue:
http://tracker.vbulletin.com/browse/VBIV-8431

The issue only impacts users with "Forum only" and does not impact any customer who utilizes our Suite product.

Downloading the fix:
If you are already running 4.0.6 Forum only, we have released a patch for the issue, which is available in our members area: http://members.vbulletin.com/

If you are yet to download 4.0.6 Forum only, we have updated the download version in the members area, and the fix is included in the product.

Sorry for the inconvenience. I might also add, we typically only release Patch Level releases for security bugs, however given the impact of this issue to our customers, we felt it warranted an update prior to our next release.

Best,
Adrian