Multiple SQL injection vulnerabilities in Moodle 1.8.x before 1.8.12 and 1.9.x before 1.9.8 allow remote attackers to execute arbitrary SQL commands via vectors related to (1) the add_to_log function in mod/wiki/view.php in the wiki module, or (2) "data validation in some forms elements" related to lib/form/selectgroups.php.
http://www.vupen.com/english/advisories/2010/1107
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
http://cvs.moodle.org/moodle/mod/wiki/view.php?r1=1.76.2.6&r2=1.76.2.7
http://cvs.moodle.org/moodle/lib/form/selectgroups.php?r1=1.2.4.2&r2=1.2.4.3