CVE-2012-2354
Moodle 2.1.x before 2.1.6 and 2.2.x before 2.2.3 allows remote authenticated users to bypass the moodle/site:readallmessages capability requirement and read arbitrary messages by using the "Recent conversations" feature with a modified parameter in a URL.
Date published : 2012-07-20
http://git.moodle.org/gw?p=moodle.git;a=commit;h=48e03792ca8faa2d781f9ef74606f3b3f0d3baec