Facebook announced Friday that up to 50 million accounts were breached in a security flaw exploited by hackers.
The leading social network said it learned this week of the attack that allowed hackers to steal “access tokens,” the equivalent of digital keys that enable them to access their accounts.Facebook chief executive Mark Zuckerberg said engineers discovered the breach on Tuesday, and patched it on Thursday night.
“We don’t know if any accounts were actually misused,” Zuckerberg said. “This is a serious issue.”
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