National Cybersecurity Center
Informational Alert

Chinese Hackers Breached Email Systems Used by U.S. House Staff


Overview
A major cyberespionage campaign tied to Chinese-linked hackers reportedly infiltrated email systems used by U.S. House of Representatives staffers on powerful committees, exposing sensitive communications and raising fresh concerns about foreign surveillance of legislative discussions and national policy.

Who Is At Risk
Staff members and personnel supporting key U.S. House committees—especially those dealing with foreign policy, intelligence, and military matters—are most at risk from this breach.

What To Watch For
Unexpected or unauthorized access alerts on your official email account, unusual message activity, or IT notifications about suspicious logins.

What to Do
If you work for a government office or handle sensitive information, immediately report anything unusual to your IT/security team and confirm that multi-factor authentication and strong email protections are in place.

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