In Moodle before 3.8.2, 3.7.5, 3.6.9 and 3.5.11, X-Forwarded-For headers could be used to spoof a user's IP, in order to bypass remote address checks.
{ "cpes": [ "cpe:2.3:a:moodle:moodle:*:*:*:*:*:*:*:*" ], "severity": "Medium" }