The Portfolio plugin in Moodle 2.1.x before 2.1.9, 2.2.x before 2.2.6, and 2.3.x before 2.3.3 allows remote authenticated users to upload and execute files via a modified Portfolio API callback.
Exploitability
AV:NAC:LAu:SImpact
C:PI:PA:P6.5/AV:N/AC:L/Au:S/C:P/I:P/A:P