When duplicating a BigBlueButton activity, the original meeting ID was also duplicated instead of using a new ID for the new activity. This could provide unintended access to the original meeting.
https://moodle.org/mod/forum/discuss.php?d=451584
https://bugzilla.redhat.com/show_bug.cgi?id=2243442
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-77795