SQL injection vulnerability in MWNewsletter 1.0.0b allows remote attackers to execute arbitrary SQL commands via the user_name parameter to unsubscribe.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/25683
http://www.vupen.com/english/advisories/2006/1270
http://www.securityfocus.com/bid/17412
http://secunia.com/advisories/19568
http://evuln.com/vulns/123/summary.html
http://archives.neohapsis.com/archives/bugtraq/2006-04/0447.html