Cross-site scripting (XSS) vulnerability in the Context module before 6.x-2.0-rc4 for Drupal allows remote authenticated users, with Administer Blocks privileges, to inject arbitrary web script or HTML via a block description.
https://exchange.xforce.ibmcloud.com/vulnerabilities/58521
http://www.theregister.co.uk/2010/05/10/drupal_security_bug/
http://www.securityfocus.com/bid/40056
http://www.madirish.net/?article=457
http://drupal.org/cvs?commit=365210
http://crackingdrupal.com/blog/greggles/mitigation-against-cve-2010-1584-drupal-context-module-xss