House Homeland committee seeks briefing on DHS network hack

House Homeland Security Committee staff requested a DHS briefing after a confirmed intrusion into the Homeland Security Information Network (HSIN) that likely occurred between late May and early June; DHS says it isolated affected systems and launched a forensic investigation but attribution and whether data were exfiltrated remain unclear. HSIN contains unclassified but sensitive information used by federal, state, local, tribal, international and private partners to coordinate security and emergency response, raising concerns about exposure of planning for high-profile events such as the World Cup.