Moodle is vulnerable to cross-site scripting (XSS) attacks. A malicious user can inject and execute arbitrary web script by passing an AJAX script to the application encoded in UTF7.
www.mandriva.com/security/advisories?name=MDVSA-2015:200
www.openwall.com/lists/oss-security/2015/04/01/1
www.openwall.com/lists/oss-security/2015/04/07/3
www.securityfocus.com/bid/73477
git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-47966
lists.wikimedia.org/pipermail/mediawiki-announce/2015-March/000175.html
moodle.org/mod/forum/discuss.php?d=275146
phabricator.wikimedia.org/T85113
security.gentoo.org/glsa/201510-05