source: https://www.securityfocus.com/bid/31467/info

PHPJabbers Post Comments is prone to an authentication-bypass vulnerability because it fails to adequately verify user-supplied input used for cookie-based authentication.

An attacker can exploit this vulnerability to gain administrative access to the affected application; other attacks are also possible.

PHPJabbers Post Comments 3.0 is vulnerable; other versions may also be affected.

javascript:document.cookie = "PostCommentsAdmin=logged; path=/