moodle/moodle uses an insecure access control. An unauthorized user is able to view the full name of other users via the online users block.
bugzilla.redhat.com/show_bug.cgi?id=1939041
github.com/advisories/GHSA-93wh-35r4-6qmw
lists.fedoraproject.org/archives/list/[email protected]/message/AFSNJ7XHVTC52RSRX2GBQFF3VEEAY2MS/
lists.fedoraproject.org/archives/list/[email protected]/message/UFH5DDMU5TZ3JT4Q52WMRAHACA5MHIMT/
moodle.org/mod/forum/discuss.php?d=419652