Facebook was repeatedly warned of security flaw that led to biggest data breach in its history

Facebook knew about a huge security flaw that let hackers to steal personal data from millions of its users almost one year before the crime, yet failed to fix it in time, the Telegraph can reveal.

Legal documents show that the company was repeatedly warned by its own employees as well as outsiders about a dangerous loophole that eventually led to the massive data breach in September 2018.

Despite this, the loophole remained open for nine months after it was first raised, leading employees to later speak of their “guilt” and “hurt” at knowing that the attack “could have been prevented”.

The breach, which involved stealing digital “access tokens” used by Facebook to verify users’ identity without needing their passwords, exposed the names, phone numbers and email addresses of 29 million people and a host of more intimate data for 14 million of them, putting users around the world at risk of identity theft….

Source: Facebook was repeatedly warned of security flaw that led to biggest data breach in its history