India, Aug. 18 -- Mac users face a serious security threat that could allow attackers to access their computers via Apple's Screen Sharing tool. The vulnerability was initially treated as a precautionary concern, as there was no evidence it had been exploited when Apple first addressed it. That has now changed, with Dutch authorities confirming (Via Engadget) that the flaw has been used to attack multiple systems. Apple has since released security updates for the affected versions of macOS. Here is what the vulnerability means, which Macs are affected and what users can do to stay protected.

The vulnerability affects Apple's Screen Sharing tool and could allow an attacker on the network to authenticate without valid credentials. In pract...