When creating a user account, it was possible to verify the account without having access to the verification email link/secret in moodle before 3.10.2, 3.9.5, 3.8.8, 3.5.17.
bugzilla.redhat.com/show_bug.cgi?id=1939046
github.com/moodle/moodle
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=419653
nvd.nist.gov/vuln/detail/CVE-2021-20282