Flip the “days since last Facebook security incident” back to zero.

Facebook confirmed Thursday in a blog post, prompted by a report by cybersecurity reporter Brian Krebs, that it stored “hundreds of millions” of account passwords in plaintext for years.

The discovery was made in January, said Facebook’s Pedro Canahuati, as part of a routine security review. None of the passwords were visible to anyone outside Facebook, he said. Facebook admitted the security lapse months later, after Krebs said logs were accessible to some 2,000 engineers and developers.

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