The core_grade component in Moodle through 2.2.10, 2.3.x before 2.3.7, and 2.4.x before 2.4.4 does not properly consider the existence of hidden grades, which allows remote authenticated users to obtain sensitive information by leveraging the student role and reading the Gradebook Overview report.
https://github.com/advisories/GHSA-wmmc-qjq2-vvm2
https://moodle.org/mod/forum/discuss.php?d=228931
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-5600
http://openwall.com/lists/oss-security/2013/05/21/1
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/107026.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/106988.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-May/106965.html
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-37475