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June: LinkedIn password breach affects 6.46 million users
A Russian forum user claimed to have downloaded 6.46 million passwords belonging to LinkedIn users, though the stolen passwords were cryptographically hashed. However, many of those passwords weren't salted, meaning it was relatively easy to convert the simpler passwords into a readable format.
LinkedIn shortly confirmed the data breach but did not explain how the passwords were accessed. Affected accounts were disabled and password reset emails were sent out. The later cleanup effort cost the professional social networking company around $1 million, and another $2-3 million in forensic work and security upgrades.