CVE-2015-5855

Apple iOS before 9 allows attackers to discover the e-mail address of a player via a crafted Game Center app...

CVE-2011-4593

Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, and 2.1.x before 2.1.3 does not properly handle user/actionredir group messages, which allows remote authenticated users to discover e-mail addresses by visiting the messaging interface...