CVE 2013-4429
Mahara before 1.5.12, 1.6.x before 1.6.7, and 1.7.x before 1.7.3 does not properly restrict access to artefacts, which allows remote authenticated users to read arbitrary artefacts via the (1) artefact id in an upload action when creating a journal or (2) instconf_
See the 
CVE page on Mitre.org
for more details.
