If the upload course tool in Moodle was used to delete an enrollment method which did not exist or was not already enabled, the tool would erroneously enable that enrollment method. This could lead to unintended users gaining access to the course. Versions affected: 3.9 to 3.9.2, 3.8 to 3.8.5, 3.7 to 3.7.8, 3.5 to 3.5.14 and earlier unsupported versions. This is fixed in moodle 3.9.3, 3.8.6, 3.7.9, 3.5.15, and 3.10.
bugzilla.redhat.com/show_bug.cgi?id=1895432
github.com/moodle/moodle/commit/b8e1eec4c77c858de87fedf4e405e929539ea0c5
lists.fedoraproject.org/archives/list/[email protected]/message/4NNFCHPPHRJNJROIX6SYMHOC6HMKP3GU
lists.fedoraproject.org/archives/list/[email protected]/message/B55KXBVAT45MDASJ3EK6VIGQOYGJ4NH6
moodle.org/mod/forum/discuss.php?d=413939
nvd.nist.gov/vuln/detail/CVE-2020-25701