Mahara before 1.3.6 does not properly restrict the data in responses to AJAX calls, which allows remote authenticated users to obtain sensitive information via a request associated with (1) blocktype/myfriends/myfriends.json.php, (2) json/usersearch.php, (3) group/membersearchresults.json.php, or (4) json/friendsearch.php, as demonstrated by information about friends and e-mail addresses.
secunia.com/advisories/44433
www.debian.org/security/2011/dsa-2246
www.securityfocus.com/bid/47798
exchange.xforce.ibmcloud.com/vulnerabilities/67395
launchpad.net/mahara/+bug/772140
launchpad.net/mahara/+bug/772160
launchpad.net/mahara/+bug/772174
launchpad.net/mahara/+bug/772179
launchpad.net/mahara/+milestone/1.3.6