Description: In LetterPress plugin <= 1.2.1 is vulnerable to Html Injection Vulnerability which can futher leads to Open Redirection Vulnerabilty.
Exploit: 1. In LetterPress plugin navigate to Add Campaign and insert the code “<a href=http://evil.com>CLICK THIS</a>” in HTML Campaign Message input field and click on Save Campaign. 2. View the campaign and click on “CLICK THIS” hyperlink it will redirect to the 3rdparty site. (Ex:evil.com)