Board Thread:General Discussion/@comment-32090487-20180413054458/@comment-1038387-20180416123648

It did not fork an old version; it forked the most recent version at the time. There are no full version upgrades of MediaWiki. But elements of newer versions are implemented. Including security.

If you have concerns over FANDOM's security, send it to Special:Contact/feedback. They'll tell you the exact same things that have been mentioned above. Don't worry about it.