Cross-site scripting (XSS) vulnerability in the API in the Simplenews module 6.x-1.x before 6.x-1.5 and 7.x-1.x before 7.x-1.1 for Drupal allows remote attackers to inject arbitrary web script or HTML via an email address.
https://exchange.xforce.ibmcloud.com/vulnerabilities/88101
https://drupal.org/node/2113515
https://drupal.org/node/2113491
https://drupal.org/node/2113487
http://secunia.com/advisories/55209
http://seclists.org/fulldisclosure/2013/Oct/120
http://packetstormsecurity.com/files/123660/Drupal-Simplenews-6.x-7.x-Cross-Site-Scripting.html