mod/glossary/showentry.php in the Glossary module for Moodle 1.8 before 1.8.11 and 1.9 before 1.9.7 does not properly perform access control, which allows attackers to read unauthorized Glossary entries via unknown vectors.
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=139103