blog/rsslib.php in Moodle 2.1.x before 2.1.10, 2.2.x before 2.2.7, 2.3.x before 2.3.4, and 2.4.x before 2.4.1 continues to provide a blog RSS feed after blogging is disabled, which allows remote attackers to obtain sensitive information by reading this feed.
https://moodle.org/mod/forum/discuss.php?d=220166
http://openwall.com/lists/oss-security/2013/01/21/1
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-37467