lib/graph_export.php in Cacti 0.8.7g, 0.8.8b, and earlier allows remote authenticated users to execute arbitrary commands via shell metacharacters in unspecified vectors.
Exploitability
AV:NAC:LAu:SImpact
C:PI:PA:P6.5/AV:N/AC:L/Au:S/C:P/I:P/A:P