Internal review discovered that Special:DeletedContributions did
not properly protect the IP of autoblocked users. This fix makes
the functionality of Special:DeletedContributions consistent with
Special:Contributions and Special:BlockList.
Internal review discovered that watchlist anti-csrf tokens were not
being compared in constant time, which could allow various timing
attacks. This could allow an attacker to modify a user's watchlist
via csrf
John Menerick reported that MediaWiki's thumb.php failed to sanitize
various error messages, resulting in xss.