Two cross-site scripting vulnerabilities have been identified in Cacti.
A remote attacker could exploit them by inciting their victim into following a specially crafted URL in order to execute arbitrary HTML/JavaScript code.
These vulnerabilities are located in the "data_sources.php" page.
The cacti packages provided by Debian Squeeze 6 and Wheezy 7 are vulnerable.
Updated, 21/06/2015:
The cacti packages provided by FreeBSD are vulnerable.