Apple has released Security Update 2013-003 for Snow Leopard, Lion and Mountain Lion. No details have yet been provided by Apple as to what specific security issues the updates address, but all the updates are available through Software Update or via Apple's website. The only description provided with the updates reads: "Security Update 2013-003 is recommended for all users and improves the security of Mac OS X."
Direct links to the updates are below:
Security Update 2013-003 for Mountain Lion
Security Update 2013-003 for Lion
