Moodle 2.0.x before 2.0.3 does not recognize the configuration setting that makes e-mail addresses visible only to course members, which allows remote authenticated users to obtain sensitive address information by reading a full profile page.
http://openwall.com/lists/oss-security/2011/11/14/1
http://moodle.org/mod/forum/discuss.php?d=175591
http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=181991e791a13a3c383234718c26c499e31d3df1