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Fake Certificates for Google, as well as potentially Mozilla, Microsoft, and other large companies, were sold and compromised, allowing for tens of thousands of Gmail accounts to get hacked and personal information stolen. Due to a loophole in international law, these fake certificates were able to be issued to a group of hackers, and so far the total issued counts at 534.
This attack seems to be primarily affecting Iranians, with 60,000 and counting being compromised, but there is still a decent chance that many others have been hacked, perhaps globally. Only time will tell the true velocity of this attack.