In moodle, some database module web services allowed students to add entries within groups they did not belong to. 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 3.8.6, 3.7.9, 3.5.15, and 3.10.
bugzilla.redhat.com/show_bug.cgi?id=1895427
github.com/moodle/moodle/commit/8169aeff59d8ed910ca3545413561005282bbd32
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=413938
nvd.nist.gov/vuln/detail/CVE-2020-25700