Quote:
Originally Posted by meeera
As with any popup, however, go to the source to upgrade, don't just click on any old popup and give it your admin password. Most actual security issues are caused by social engineering (convincing you to give malware privileges), not by system vulnerabilities.
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Not very common on a Mac. I assume the System Update came up... Mac users are used to it and what it looks like.
That all said, this was a "long existing" problem, so while it is a critical issue its probably a low priority one. It also existed in iOS, so make sure you update those too. That one is probably a bigger deal, since mobile devices are more likely to be on untrusted WiFi networks.