Secunia Security Advisory – A vulnerability has been reported in Simple Form, which can be exploited by malicious people to use it as an open mail relay. Versions below 2.2 are affected.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34060/sa12297.txt
Source: https://packetstormsecurity.com/files/34060/Secunia-Security-Advisory-12297.html