It was possible for some users without permission to view other users' full names to do so via the online users block in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
{
"severity": "Medium",
"cpes": [
"cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*"
]
}