A breach at the heart of America's homeland-security apparatus - and a masterclass in why "unclassified" is not the same as "unimportant." The US Department of Homeland Security has confirmed that attackers broke into the Homeland Security Information Network, or HSIN - the platform it uses to share sensitive-but-unclassified information with thousands of federal, state, local and private-sector partners, and one currently helping coordinate security for the 2026 World Cup. Classified systems were untouched, but what the intruders took, and who they are, remains unknown. We dig into the danger of "sensitive-but-unclassified" data, why legacy collaboration systems are prime targets, and how to communicate honestly when you know attackers got in but not yet what they took.

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Sources: BleepingComputer; Nextgov/FCW; TechCrunch; PYMNTS; UpGuard.