Open redirect vulnerability in Users/Account/LogOff in Orchard 1.0.x before 1.0.21, 1.1.x before 1.1.31, 1.2.x before 1.2.42, and 1.3.x before 1.3.10 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the ReturnUrl parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/72110
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-5151
http://www.securityfocus.com/bid/51260
http://www.mavitunasecurity.com/open-redirection-vulnerability-in-orchard/
http://secunia.com/advisories/47398
http://orchard.codeplex.com/discussions/283667
http://archives.neohapsis.com/archives/bugtraq/2012-01/0023.html