lib/adminlib.php in Moodle through 2.3.11, 2.4.x before 2.4.8, 2.5.x before 2.5.4, and 2.6.x before 2.6.1 logs cleartext passwords, which allows remote authenticated administrators to obtain sensitive information by reading the Config Changes Report.
https://moodle.org/mod/forum/discuss.php?d=252414
http://www.securitytracker.com/id/1029647
http://openwall.com/lists/oss-security/2014/01/20/1
http://lists.fedoraproject.org/pipermail/package-announce/2014-January/127533.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-January/127510.html
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-36721