1. The U.S. Congressional Budget Office (CBO) has confirmed it was hacked.
- CBO is investigating the incident, taking immediate actions to contain it and implementing additional security measures to protect its systems.
- Foreign hackers are suspected to be behind the intrusion, with concerns about potential access to internal emails, chat logs, and communications between lawmakers and CBO researchers.

2. Security researcher Kevin Beaumont suspects hackers may have exploited CBO's outdated Cisco firewall to gain access.
- The CBO's firewall was last patched in 2024, leaving it vulnerable to a series of newly discovered security bugs that were being exploited by suspected Chinese government-backed hackers.
- The firewall was allegedly still vulnerable during the federal government shutdown in October.

3. The Senate Sergeant at Arms office warned congressional offices about the potential compromise of emails between CBO and their offices, suggesting a risk of phishing attacks.
- Offices were advised to be vigilant as hackers may use compromised emails for further malicious activities.
- As of Thursday, the CBO's firewall is now offline, but neither CBO nor Cisco have commented on Beaumont's findings.