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Congressional Budget Office hacked by suspected foreign entity

The breach may have exposed lawmakers' communications and critical financial data, prompting FBI and Cybersecurity and Infrastructure Security Agency investigations.

  • On Thursday, the U.S. Congressional Budget Office was hacked by a suspected foreign actor, with the incident discovered in recent days and now under investigation.
  • The CBO, which offers independent economic and budget analysis for Congress, handles sensitive information influencing legislation and faces recurring network threats it continually monitors.
  • Several sources told The Post that `Officials discovered the incursion in recent days and now worry that communications between lawmakers' offices and nonpartisan researchers could have been accessed by an adversary or one of its digital proxies, as well as internal email and office chat logs`, prompting FBI and CISA involvement.
  • CBO spokeswoman Caitlin Emma said the agency identified the incident, took immediate containment steps, and implemented additional monitoring and new security controls with no further details.
  • Investigators say it remains unclear who is behind the breach and how much was taken, while the incident potentially exposed key financial research data Congress uses to craft legislation amid an ongoing investigation.
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Center

US Congressional Budget Office hit by suspected cyberattack - here's what we know

Foreign adversaries may have accessed a congressional network.

·United Kingdom
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Spectrum Local NewsSpectrum Local News
+3 Reposted by 3 other sources
Center

Congressional Budget Office says it implemented new security measures after hack

The small government office, with some 275 employees, provides objective, impartial analysis to support lawmakers during the budget process.

·United States
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Axios broke the news in Washington, United States on Thursday, November 6, 2025.
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