Verizon Communications is warning that an insider data breach impacts almost half its workforce, exposing sensitive employee information.

A data breach notification shared with the Office of the Maine Attorney General reveals that a Verizon employee gained unauthorized access to a file containing sensitive employee information on September 21, 2023.

Verizon discovered the breach on December 12, 2023, nearly three months later, and determined it contained sensitive information of 63,206 employees.

“At this time, we have no evidence that this information has been misused or shared outside of Verizon as a result of this issue,” reads the Verizon data breach notification.

To protect exposed individuals from the risks posed by the security incident, Verizon has enclosed instructions on enrolling in a two-year identity theft protection and credit monitoring service in the notices sent to impacted employees.

Verizon recently discovered that an employee inappropriately handled a file containing certain personal information about some Verizon employees.