Cybersecurity Policy Report, Data Breach at DHS ‘Deeply’ Concerning, Sen. Warner Says, (Jul 6, 2026)
The Department of Homeland Security should “thoroughly investigate” a breach of its Homeland Security Information Network (HSIN) and take steps to prevent future breaches, according to Sen. Mark Warner (D., Va.), vice chairman of the Senate Intelligence Committee.
“I am deeply concerned by the recent revelation of a compromise of DHS’s Homeland Security Information Network (HSIN). For more than two decades, the HSIN platform has been used by federal, state, local, Tribal, territorial law enforcement, and private sector partners, to share intelligence, plan, coordinate, and collaborate on events, and respond to incidents,” Sen. Warner said in a statement issued last Wednesday.
“HSIN is currently sharing intelligence across law enforcement and homeland security communities, supporting the safety and security of the FIFA World Cup, America250, and other major events, and is critical to emergency response in the event of disaster,” he noted.
“The information in HSIN, while not classified, is highly sensitive, and its exposure risks national security. DHS and DOJ must thoroughly investigate who breached HSIN, what the attackers accessed, and ensure all DHS partners are provided with timely information and the tools necessary to mitigate any associated risks from the breach,” he said.
“Furthermore, DHS must take a serious look within and account for how this happened and ensure a breach like this does not happen again. The homeland security community needs to have confidence that the information in HSIN is secure, and the American public needs to be able to trust that the Department responsible for America’s cybersecurity has its own house in order,” Sen. Warner added.
In a statement e-mailed today to CPR, a DHS spokesperson said the department was “aware of a recent cyber incident involving a specific, unclassified legacy information sharing environment.
“We immediately took action to isolate the affected systems, mitigate the vulnerability, and launch a comprehensive forensic investigation,” the spokesperson said. “There is no indication that classified networks were impacted, and the system remains operational for our partners. As this is an ongoing investigation, we cannot provide further operational details at this time.”
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