Oracle has released Java 7 Update 45. The Oracle blog post about the release of Java 7 Update 45 mentions security updates and according to the Oracle Critical Patch Update Advisory for October 2013 mentions up to 51 security fixes.
So, if you’re using Java, you should probably update. ASAP.
You can download Java at http://www.java.com/en/download/index.jsp or if you want to manually download Java for Windows, Mac, Linux, see
http://www.oracle.com/technetwork/java/javase/downloads/jre7-downloads-1880261.html
If you have older versions of Java, you should remove them as soon as possible. The http://www.java.com/en/download/faq/remove_olderversions.xml page has more information and tools on how to remove older versions of Java.
As a additional security precaution, you can disable the execution of Java content in your browser.
