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.
Improper Input Validation The product receives input or data, but it does
not validate or incorrectly validates that the input has the
properties that are required to process the data safely and
correctly.