Fenrir Sleipnir 2.9.6 and earlier does not prevent interaction between web script and the clipboard, which allows remote attackers to read or modify the clipboard contents via a crafted web site.
http://www.fenrir.co.jp/blog/2010/11/post_47.html
http://secunia.com/advisories/42427
http://jvndb.jvn.jp/en/contents/2010/JVNDB-2010-000057.html
http://jvn.jp/en/jp/JVN64764004/index.html
http://fenrir-inc.blogspot.com/2010/11/vulnerability-regarding-allow-paste.html