Washington lawmakers seek briefing on DHS network hack | JQJO

Washington, D.C. – The U.S. House Committee on Homeland Security has formally requested a detailed briefing from the Department of Homeland Security (DHS) on a major cyberattack that compromised the Homeland Security Information Network (HSIN). The July 10, 2026 request follows public revelations that unauthorized cyber intruders successfully breached the unclassified but highly sensitive information-sharing platform, which is currently being used to coordinate safety and security planning for the upcoming FIFA World Cup matches across the United States. Lawmakers say they want DHS to explain how existing security protocols were bypassed, which specific vulnerabilities were exploited, the volume and nature of the data that was accessed, and what immediate steps are being taken to secure HSIN and related systems before major national events.

Washington, D.C. – The committee’s action highlights mounting concern in Congress over the resilience of critical government communication networks that support real-time coordination among law enforcement and security partners. The cyberattack on HSIN is believed to have occurred between late May and early June 2026, with details of the breach emerging publicly in late June. According to individuals familiar with the matter, the threat actors targeted not only HSIN servers but also a collaborative SharePoint-based system used by partner agencies. The DHS Office of Intelligence and Analysis is conducting a comprehensive damage assessment to determine the full scope of the intrusion into the platform, which serves thousands of approved federal, state, local, tribal, territorial, and international users for incident management and information sharing.