Mahara before 20.10.5, 21.04.4, 21.10.2, and 22.04.0 is vulnerable to Cross Site Request Forgery (CSRF) because randomly generated tokens are too easily guessable.
Mahara before 20.10.5, 21.04.4, 21.10.2, and 22.04.0 allows stored XSS when a particular Cascading Style Sheets (CSS) class for embedly is used, and JavaScript code is constructed to perform an action.
In Mahara before 20.10.5, 21.04.4, 21.10.2, and 22.04.0, a site using Isolated Institutions is vulnerable if more than ten groups are used. They are all shown from page 2 of the group results list (rather than only being shown for the institution that the viewer is a member of).
Mahara 20.10 is affected by Cross Site Request Forgery (CSRF) that allows a remote attacker to remove inbox-mail on the server. The application fails to validate the CSRF token for a POST request. An attacker can craft a module/multirecipientnotification/inbox.php pieform_delete_all_notifications request, which leads to removing all messages from a mailbox.