Apple pushes out Java security update
The Tuesday update for OS X Lion and Mac OS X 10.6 is said to fix "multiple vulnerabilities in Java 1.6.0_29" that could allow a piece of code to be run just by visiting an offending webpage.
From Apple's support page document:
Description: Multiple vulnerabilities exist in Java 1.6.0_29, 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. These issues are addressed by updating to Java version 1.6.0_31. Further information is available via the Java website at http://www.oracle.com/technetwork/java/javase/releasenotes-136954.html