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Congressional Budget Office believed to be hacked by foreign actor

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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Congressional Budget Office hacked by suspected foreign entity: report

The breach could expose sensitive government data and communications with House and Senate offices

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