Debian Security Advisory 1642-1 – Will Drewry discovered that the Horde, allows remote attackers to send an email with a crafted MIME attachment filename attribute to perform cross site scripting.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70161/dsa-1642-1.txt
Source: https://packetstormsecurity.com/files/70161/Debian-Linux-Security-Advisory-1642-1.html