graph_realtime.php in Cacti 1.2.8 allows remote attackers to execute arbitrary OS commands via shell metacharacters in a cookie, if a guest user has the graph real-time privilege.

Cacti 1.2.8 allows Remote Code Execution (by privileged users) via shell metacharacters in the Performance Boost Debug Log field of poller_automation.php. OS commands are executed when a new poller cycle begins. The attacker must be authenticated, and must have access to modify the Performance Settings of the product.

data_input.php in Cacti 1.2.8 allows remote code execution via a crafted Input String to Data Collection -> Data Input Methods -> Unix -> Ping Host. NOTE: the vendor has stated "This is a false alarm.