Top U.S. Banks Cut Off Digital Data Sharing With OCC After Major Cyberattack

Several of the largest banks in the United States have curtailed or reassessed how they share sensitive data with the Office of the Comptroller of the Currency (OCC), after a significant cyberattack compromised the regulator’s email system. 

According to Bloomberg, JPMorgan Chase and Bank of New York Mellon have paused all electronic communications with the OCC. Bank of America is continuing to share data, but through what it considers more secure digital channels. The decision follows the discovery that hackers had accessed over 100 email accounts at the OCC for more than a year—a breach labeled a “major incident” by both the OCC and the U.S. Treasury Department. 

The hackers reportedly obtained highly sensitive information related to financial institutions, although their identities remain unknown. The OCC, a bureau under the Treasury, oversees over 1,000 national banks and savings associations, including the U.S. branches of foreign institutions.

Among the materials potentially exposed are reports on cybersecurity protocols, internal vulnerability assessments, and National Security Letters—documents that may contain classified intelligence regarding terrorism or espionage. 

Banks have raised concerns about the extent of the breach and the OCC’s communication about the incident. Some financial institutions reportedly did not learn of the scope of the compromise until media coverage surfaced. As a result, there is

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