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 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.

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.

In Mahara before 20.04.5, 20.10.3, 21.04.2, and 21.10.0, the account associated with a web services token is vulnerable to being exploited and logged into, resulting in information disclosure (at a minimum) and often escalation of privileges.

In Mahara before 20.04.5, 20.10.3, 21.04.2, and 21.10.0, exported CSV files could contain characters that a spreadsheet program could interpret as a command, leading to execution of a malicious string locally on a device, aka CSV injection.

An issue was discovered in Mahara before 18.10.0. It mishandled user requests that could discontinue a user's ability to maintain their own account (changing username, changing primary email address, deleting account). The correct behavior was to either prompt them for their password and/or send a warning to their primary email address.

Mahara 15.04 before 15.04.9 and 15.10 before 15.10.5 and 16.04 before 16.04.3 are vulnerable to a group's configuration page being editable by any group member even when they didn't have the admin role.

Mahara 15.04 before 15.04.8 and 15.10 before 15.10.4 and 16.04 before 16.04.2 are vulnerable to profile pictures being accessed without any access control checks consequently allowing any of a user's uploaded profile pictures to be viewable by anyone, whether or not they were currently selected as the "default" or used in any pages.

Mahara 15.04 before 15.04.8 and 15.10 before 15.10.4 and 16.04 before 16.04.2 are vulnerable to some authentication methods, which do not use Mahara's built-in login form, still allowing users to log in even if their institution was expired or suspended.

Mahara 15.04 before 15.04.10 and 15.10 before 15.10.6 and 16.04 before 16.04.4 are vulnerable to incorrect access control after the password reset link is sent via email and then user changes default email, Mahara fails to invalidate old link.Consequently the link in email can be used to gain access to the user's account.

Mahara 15.04 before 15.04.7 and 15.10 before 15.10.3 running PHP 5.3 are vulnerable to one user being logged in as another user on a separate computer as the same session ID is served. This situation can occur when a user takes an action that forces another user to be logged out of Mahara, such as an admin changing another user's account settings.

Mahara 15.04 before 15.04.9 and 15.10 before 15.10.5 and 16.04 before 16.04.3 are vulnerable to passwords or other sensitive information being passed by unusual parameters to end up in an error log.

Mahara 15.04 before 15.04.7 and 15.10 before 15.10.3 are vulnerable to prevent session IDs from being regenerated on login or logout. This makes users of the site more vulnerable to session fixation attacks.

Mahara 1.10 before 1.10.9 and 15.04 before 15.04.6 and 15.10 before 15.10.2 are vulnerable to XSS due to window.opener (target="_blank" and window.open())

Mahara 15.04 before 15.04.8 and 15.10 before 15.10.4 and 16.04 before 16.04.2 are vulnerable to PHP code execution as Mahara would pass portions of the XML through the PHP "unserialize()" function when importing a skin from an XML file.

Mahara 15.04 before 15.04.8 and 15.10 before 15.10.4 and 16.04 before 16.04.2 are vulnerable to a user - in some circumstances causing another user's artefacts to be included in a Leap2a export of their own pages.

Mahara 15.04 before 15.04.8 and 15.10 before 15.10.4 and 16.04 before 16.04.2 are vulnerable to users staying logged in to their Mahara account even when they have been logged out of Moodle (when using MNet) as Mahara did not properly implement one of the MNet SSO API functions.