Debian Linux Security Advisory 2091-1 – SquirrelMail, a webmail application, does not employ a user-specific token for webforms. This allows a remote attacker to perform a Cross Site Request Forgery (CSRF) attack. The attacker may hijack the authentication of unspecified victims and send messages or change user preferences among other actions, by tricking the victim into following a link controlled by the offender.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/92724/dsa-2091-1.txt
Source: https://packetstormsecurity.com/files/92724/Debian-Linux-Security-Advisory-2091-1.html