Security Update 2015-007 & Others for OS X Mavericks & Yosemite Released
Apple has released Security Update 2015-007 for Macs running OS X Yosemite and OS X Mavericks, Safari 9.0.1 for OS X Mavericks and Yosemite, alongside a Mac EFI Security Update for some specific Macs. The security updates are recommended for Mac users to install, particularly if they’re not yet updating to OS X El Capitan.
OS X El Capitan users will find the OS X 10.11.1 update contains the same security fixes, and thus does not require a separate security update.