Twitter is recommending that all 336 million users change their passwords as soon as possible due to the discovery of an internal security flaw. While the issue has been fixed and no data breach seems to have taken place, Twitter is clearly taking this situation seriously.
Final Source blog
A major vulnerability has been discovered that affects everyone that uses Wi-Fi. Key Reinstallation Attack, or KRACK, affects the core encryption protocol that most Wi-Fi users depend upon to shield their browsing from others, Wi-Fi Protected Access 2 (WPA2).
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