The mail component in Mozilla SeaMonkey before 1.1.19 does not properly restrict execution of scriptable plugin content, which allows user-assisted remote attackers to obtain sensitive information via crafted content in an IFRAME element in an HTML e-mail message, as demonstrated by a Flash object that sends arbitrary local files during a reply or forward operation.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10271
https://bugzilla.mozilla.org/show_bug.cgi?id=371976
http://www.vupen.com/english/advisories/2010/0648
http://www.securityfocus.com/bid/38830
http://www.mozilla.org/security/announce/2010/mfsa2010-06.html
http://secunia.com/advisories/39001
http://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html