Stack Overflow hacker went undetected for a week

The hacker who breached Stack Overflow last week managed to access data on user accounts, the company said today in an update on its investigation into a security breach it disclosed last night. The update comes to shed some light into what happened on the company’s servers last week, after Stack Overflow left many users scratching their heads when it posted a very short message on Thursday, announcing a severe breach of its production systems.

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