UI/Manage.pm in Foswiki 1.1.0 and 1.1.1 allows remote authenticated users to gain privileges by modifying the GROUP and ALLOWTOPICCHANGE preferences in the topic preferences for Main.AdminGroup.
https://exchange.xforce.ibmcloud.com/vulnerabilities/63253
http://www.securityfocus.com/bid/44858
http://sourceforge.net/mailarchive/message.php?msg_name=4CD9F6F5.4030204%40lavrsen.dk