The KSES text cleaning filter in lib/weblib.php in Moodle before 1.8.13 and 1.9.x before 1.9.9 does not properly handle vbscript URIs, which allows remote authenticated users to conduct cross-site scripting (XSS) attacks via HTML input.
Exploitability
AV:NAC:LAu:SImpact
C:NI:PA:N4/AV:N/AC:L/Au:S/C:N/I:P/A:N