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Apple today released Security Update 2014–002 for Mavericks, Mountain Lion, and Lion users



From MacRumors:
The update includes fixes for several operating system vulnerabilities, detailed on Apple's support page. Apple recommends that all users download the update, which can be acquired via the Software Update tool in the Mac App Store or through the following links
  Apple Releases OS X Security Update for Mavericks, Mountain Lion, and Lion Users