Issue #2889855 by seanB, chr.fritsch, vijaycs85, phenaproxima, marcoscano, Wim...

Issue #2889855 by seanB, chr.fritsch, vijaycs85, phenaproxima, marcoscano, Wim Leers, govind.maloo, larowlan, pk188, Dinesh18, balazswmann, michael_wojcik, catch, effulgentsia, alexpott, Berdir, dawehner: Unpublished media entity can not be accessed by owner and update any media/delete any media access possibly cached by user

(cherry picked from commit 9cd5ccca)