What we found out and what is a subject of a new security
vulnerability (Issue 53) is that unsigned Java code can be
successfully executed on a target Windows system regardless
of the four Java Control Panel settings described above.
Our Proof of Concept code that illustrates Issue 53 has been
successfully executed in the environment of latest Java SE
7 Update 11 (JRE version 1.7.0_11-b21) under Windows 7 OS
and with "Very High" Java Control Panel security settings.
Источник: http://seclists.org/fulldisclosure/2013/Jan/241
Epic fail ? Есть пара мыслей как, надо проверять )