Agreed to fix within 12 months by http://scheduling.ocharles.org.uk and http://chatlogs.musicbrainz.org/musicbrainz-devel/2012/2012-03/2012-03-26.html#T19-36-54-3898

This seems to be pretty easy to do intentionally (or programatically). There is no validation that the voting user is not the same as the editor.

Login, saving session cookies:
wget --keep-session-cookies --save-cookies cookies.txt --post-data 'username=Hawke&password=xxxxx' http://musicbrainz.org/login

Submit vote:
wget --load-cookies cookies.txt --post-data 'url=http://musicbrainz.org/edit/16944694&enter-vote.vote.0.edit_id=16944694&enter-vote.vote.0.vote=1&submit=Enter vote' http://musicbrainz.org/edit/enter_votes

This is in review at http://codereview.musicbrainz.org/r/1961/ and available for testing at http://test.musicbrainz.org/

The origin/mbs-3904 branch is now in beta testing.