Moodle Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2013-1835
Moodle 2.x through 2.1.10 2.2.x before 2.2.8 2.3.x before 2.3.5 and 2.4.x before 2.4.2 allows remote authenticated administrators to obtain sensitive information from the external repositories of arbitrary users by leveraging the login_as feature.