Description
WordPress Plugin Plugin:Newsletter is prone to an information disclosure vulnerability because it fails to properly sanitize user-supplied input. Attackers can exploit this issue to obtain sensitive information that may help in launching further attacks. WordPress Plugin Plugin:Newsletter version 1.5 is vulnerable; prior versions may also be affected.
Remediation
Edit the source code to ensure that input is properly verified or disable the plugin until a fix is available
References
http://www.securityfocus.com/bid/53900/exploit
http://www.exploit-db.com/exploits/19018/
http://1337day.com/exploits/18489
http://packetstormsecurity.com/files/113413/WordPress-Newsletter-1.5-File-Disclosure.html
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