WordPress before 4.4 makes it easier for remote attackers to predict password-recovery tokens via a brute-force approach.
https://core.trac.wordpress.org/ticket/28633
https://bugzilla.redhat.com/show_bug.cgi?id=1192474
http://www.securitytracker.com/id/1031749
http://www.securityfocus.com/bid/72589
http://seclists.org/fulldisclosure/2015/Feb/53
http://seclists.org/fulldisclosure/2015/Feb/42
http://packetstormsecurity.com/files/130380/WordPress-Failed-Randomness.html