The Office of the Comptroller of the Currency notified Congress on Tuesday of a “major” security breach of its email system earlier this year.

The OCC was made aware of “unusual interactions between a system administrative account in its office automation environment and OCC user mailboxes” on Feb. 11 and confirmed that the “activity was unauthorized” on Feb. 12, according to a press release.

At that point, OCC “activated its incident response protocols,” which the independent bureau said include “initiating an independent third-party incident assessment and reporting the incident to the Cybersecurity and Infrastructure Security Agency.”

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