An unidentified threat actor breached the Homeland Security Information Network (HSIN), a sensitive but unclassified database used by federal, state, and private partners. Following the breach, the Department of Homeland Security isolated the HSIN network. The DHS Office of Intelligence and Analysis conducted a damage assessment of the incident. During the breach, hackers targeted the network's servers and SharePoint infrastructure. The Department of Homeland Security found no evidence indicating that classified networks were impacted by the breach. The HSIN system facilitates information sharing across government levels and with private sector partners. Officials continue to monitor the situation as the assessment proceeds. The scope of the data potentially accessed remains under review. No specific timeline for the restoration of full network services has been released. The incident highlights the ongoing cybersecurity challenges faced by federal agencies. Further details regarding the origin of the attack have not been disclosed. The department is coordinating with relevant partners to address the vulnerability. This event marks another instance of cyber intrusions targeting government infrastructure. Stakeholders are being notified as part of the standard response protocol. The integrity of the unclassified data is a primary focus of the ongoing investigation.