Moodle 1.8 before 1.8.11 and 1.9 before 1.9.7 stores (1) password hashes and (2) unspecified "secrets" in backup files, which might allow attackers to obtain sensitive information.
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00751.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00730.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00704.html
http://www.vupen.com/english/advisories/2009/3455
http://www.securityfocus.com/bid/37244
http://secunia.com/advisories/37614
http://moodle.org/mod/forum/discuss.php?d=139110