Hi all,
As some you may remember, two years ago all upload tools to Commons
broke when changes to the upload interface were made. These changes
were reverted [1]. However, as it turned out that this had security
implications, the restrictions have been put back into place [2].
If you use an upload tool that used to work but doesn't anymore, this
might be the cause.
Bryan
[1]
https://www.mediawiki.org/wiki/Special:Code/MediaWiki/56793
[2]
https://bugzilla.wikimedia.org/show_bug.cgi?id=35317