SQL injection vulnerability in the user.authenticate method in the API in Zabbix 1.8 before 1.8.2 allows remote attackers to execute arbitrary SQL commands via the user parameter in JSON data to api_jsonrpc.php.
http://www.zabbix.com/rn1.8.2.php
http://www.vupen.com/english/advisories/2010/0799
http://www.securityfocus.com/archive/1/510480/100/0/threaded