Secunia Security Advisory – A vulnerability has been reported in Horde IMP and Horde Groupware Webmail Edition, which can be exploited by malicious users to conduct spoofing attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/76830/sa34796.txt
Source: https://packetstormsecurity.com/files/76830/Secunia-Security-Advisory-34796.html