The U.S. federal judiciary's electronic case filing system, including CM/ECF and PACER, has been compromised in a widespread cyberattack, according to multiple reports including Politico. The breach is believed to have potentially exposed the identities of confidential informants involved in criminal cases across several federal district courts. The Administrative Office of the U.S. Courts confirmed that their IT systems have been targeted by recent escalated cyberattacks described as sophisticated and persistent. Legal professionals use CM/ECF to upload and manage case documents, while PACER provides limited public access to these records. The judiciary's core case management systems have been previously identified as outdated and vulnerable to cyber risks, with calls for their replacement. The full extent of data accessed or altered remains unclear, raising concerns about national security and the integrity of the legal process.