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DHS Confirms Breach of Homeland Security Information Network

ID: 74bf40f1-800f-5080-8b67-8693e8014cb7

STIX ID: report--74bf40f1-800f-5080-8b67-8693e8014cb7

Feed Name: TechRepublic Security

Threat Score
65/100

Date Published: 2026-07-06

Date Updated: 2026-07-07

Author: Joseph Ofonagoro

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The Department of Homeland Security confirmed that its Homeland Security Information Network (HSIN) and connected SharePoint systems were breached and occupied for weeks; affected systems were isolated, a vulnerability was mitigated, and forensic investigation is underway to determine scope and any data accessed, with particular concern about sensitive but unclassified operational information shared among agencies and partners.

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