However, the report mentioned that the company's gaming floors were back online on Monday evening. Still, MGM has not further updated its reservation and room booking systems.
The report added that the FBI was aware of the ongoing issue but did not provide further information.
The outage affected reservation platforms, booking systems, electronic hotel key card systems, and casino floors, CNBC noted.
In reaction to the cybersecurity concern, the company's email systems were also disabled and have not been restored yet, the report mentioned.
Price Action: MGM shares are trading lower by 0.37% to $42.54 premarket on the last check Tuesday.
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