Cross-site scripting (XSS) vulnerability in the tag autocomplete functionality in Moodle 1.9.x before 1.9.11 and 2.0.x before 2.0.2 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
http://openwall.com/lists/oss-security/2011/11/14/1
http://moodle.org/mod/forum/discuss.php?d=170003
http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=fd29b2ad1c20906da00d7e523f39bc8a0358a65b