Cross-site scripting (XSS) vulnerability in block_class.module in the Block Class module before 7.x-1.1 for Drupal allows remote authenticated users with certain permissions to inject arbitrary web script or HTML via the class name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/73776
http://www.securityfocus.com/bid/52341
http://www.openwall.com/lists/oss-security/2012/04/07/1
http://secunia.com/advisories/48298
http://drupalcode.org/project/block_class.git/commit/9a5205d