DHS confirms hackers breached HSIN info

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DHS confirms hackers breached HSIN info

Bleepingcomputer •Lawrence Abrams • July 1, 2026

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The Department of Homeland Security is investigating a cyberattack that compromised the Homeland Security Information Network (HSIN), a sensitive information-sharing platform used by federal, state, local, and private-sector partners. [...]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

DHS Investigates Breach of HSIN Information-Sharing Network The Department of Homeland Security (DHS) is investigating a breach of the Homeland Security Information Network (HSIN), which occurred between late May and early June 2026. An unknown threat actor accessed the network, potentially exposing sensitive data shared among federal, state, local, and private-sector partners. The attack targeted HSIN servers and a SharePoint system used for collaboration. DHS has not attributed the attack to any specific group and is assessing the extent of the damage. The breach raises concerns about the security of information related to major events, particularly with the World Cup taking place across the U.S. The system remains operational for partners, and classified networks were not affected. This incident follows a previous security issue in 2023 involving an access misconfiguration that exposed sensitive data. The investigation is ongoing, and DHS has taken steps to isolate affected systems. 19 sources 52

Extracted Entities

Attack Types (1)

Companies (1)

Department of Homeland Security

Countries (1)

CWE Weaknesses (1)

CWE-200 - Exposure of Sensitive Information

Platforms (2)

Homeland Security Information Network SharePoint