On all WMF projects (except for test.wikipedia.org and meta.wikimedia.org) the software is broken. All pages when I attempted to access my account were redirected to a spam message looking like this:
Fatal exception of MW type error: hash f1ws0h3lfyopy784fta1702gus76m5j37dse09
When I tried to access other language wikipedias it showed the same message but in different languages. Also the case for WMF projects.
Sysadmins, fix this as soon as possible.