Cross-site scripting (XSS) vulnerability in acknow.php in Zabbix before 1.8.6 allows remote attackers to inject arbitrary web script or HTML via the backurl parameter.

zabbix_agentd in Zabbix before 1.8.6 and 1.9.x before 1.9.4 allows context-dependent attackers to cause a denial of service (CPU consumption) by executing the vfs.file.cksum command for a special device, as demonstrated by the /dev/urandom device.

Zabbix before 1.8.6 allows remote attackers to obtain sensitive information via an invalid srcfld2 parameter to popup.php, which reveals the installation path in an error message.

Multiple cross-site scripting (XSS) vulnerabilities in the formatQuery function in frontends/php/include/classes/class.curl.php in Zabbix before 1.8.3rc1 allow remote attackers to inject arbitrary web script or HTML via the (1) filter_set, (2) show_details, (3) filter_rst, or (4) txt_select parameters to the triggers page (tr_status.php). NOTE: some of these details are obtained from third party information.

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.