:: Deepquest ::

Apple Security Advisory 2011-06-28-2 – Multiple vulnerabilities exist in Java 1.6.0_24, the most serious of which may allow an untrusted Java applet to execute arbitrary code outside the Java sandbox. Visiting a web page containing a maliciously crafted untrusted Java applet may lead to arbitrary code execution with the privileges of the current user.

See more here:
Apple Security Advisory 2011-06-28-2