Puppet before 2.6.17 and 2.7.x before 2.7.18, and Puppet Enterprise before 2.5.2, allows remote authenticated users to read arbitrary files on the puppet master server by leveraging an arbitrary user's certificate and private key in a GET request.
Exploitability
AV:NAC:LAu:SImpact
C:PI:NA:N4/AV:N/AC:L/Au:S/C:P/I:N/A:N