CBO systems accessed in ‘security incident’ possibly tied to foreign hackers

The Congressional Budget Office (CBO) experienced a security breach in which its systems were accessed, and the incident may be tied to a foreign adversary. CBO says it has contained the incident, added monitoring and controls, and is investigating; CISA and congressional committees are monitoring the situation. No technical details, indicators, or confirmation of data theft are provided in the report, but CBO data are noted as high-value and potentially sensitive.