Cross-site request forgery (CSRF) vulnerability in the sign-out page in Vanilla 1.1.4 and earlier allows remote attackers to hijack the authentication of arbitrary users for requests that trigger a logout via a SignOutNow action to people.php.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44748
https://exchange.xforce.ibmcloud.com/vulnerabilities/44558
http://secunia.com/advisories/31527
http://lussumo.com/docs/doku.php?id=vanilla:releasenotes
http://lussumo.com/community/discussion/8559/vanilla-115-release-candidate-1/