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.
cvs.moodle.org/moodle/lib/weblib.php?r1=1.812.2.114&r2=1.812.2.115
cvs.moodle.org/moodle/lib/weblib.php?r1=1.970.2.171&r2=1.970.2.172
docs.moodle.org/en/Moodle_1.8.13_release_notes
docs.moodle.org/en/Moodle_1.9.9_release_notes
lists.fedoraproject.org/pipermail/package-announce/2010-June/043285.html
lists.fedoraproject.org/pipermail/package-announce/2010-June/043291.html
lists.fedoraproject.org/pipermail/package-announce/2010-June/043340.html
lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
moodle.org/mod/forum/discuss.php?d=152368
tracker.moodle.org/browse/MDL-22042
www.openwall.com/lists/oss-security/2010/06/21/2
www.vupen.com/english/advisories/2010/1530
www.vupen.com/english/advisories/2010/1571
bugzilla.redhat.com/show_bug.cgi?id=605809
github.com/moodle/moodle
github.com/moodle/moodle/commit/704c5dfed4f4531b6d74d19cfad573984e74885e
nvd.nist.gov/vuln/detail/CVE-2010-2230
web.archive.org/web/20100621005117/secunia.com/advisories/40248
web.archive.org/web/20100711044720/secunia.com/advisories/40352