ID numbers displayed in the quiz grading report required additional sanitizing to prevent a stored XSS risk.
https://moodle.org/mod/forum/discuss.php?d=451587
https://bugzilla.redhat.com/show_bug.cgi?id=2243445
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-78971