A vulnerability was found in moodle before versions 3.6.3 and 3.5.5. There was a link to site home within the the Boost theme’s secure layout, meaning students could navigate out of the page.
bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3851
github.com/moodle/moodle
github.com/moodle/moodle/commit/7f22b14efb3408645cede026ad11126f17e3f59a
github.com/moodle/moodle/commit/911f7488068a56b05b0ad87be8f9e132075ab0a6
github.com/moodle/moodle/commit/c430bed525c4c7e6e5a1c0f7222bc323cf9b6245
moodle.org/mod/forum/discuss.php?d=384014#p1547746
nvd.nist.gov/vuln/detail/CVE-2019-3851