After disclosing multiple Windows vulnerabilities over the past month, Google's Project Zero just turned its eyes towards Apple flaws.
The vulnerability posed little risk to most users.
The new malware program is an OS X version of a Windows backdoor called XSLCmd, researchers from FireEye said.
Apple last allowed public testing of a pre-release OS 14 years ago, but now it's letting OS X 10.10 out for an early spin.
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IOS users were kept vulnerable for three weeks to known security issues previously patched in Safari for OS X, a former Apple employee said.
Apple's Mail, FaceTime, Calendar, Safari browser and Software Update could be vulnerable, a researcher said.