mod/assign/locallib.php in the assignment module in Moodle 2.3.x before 2.3.7 and 2.4.x before 2.4.4 does not consider capability requirements during the processing of ZIP assignment-archive download (aka downloadall) requests, which allows remote authenticated users to read other users' assignments by leveraging the student role.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.