Despite the company’s announcement on X, formerly Twitter, on Thursday that operations had returned to normal, a number of users still reported issues with its mobile app.
Rival casino owner Caesars Entertainment also disclosed last week to federal regulators that it was hit by a cyberattack Sept. 7.
It said that its casino and online operations were not disrupted but it could not guarantee that personal information about tens of millions of customers, including driver’s licenses and Social Security numbers of loyalty rewards members, had not been compromised.
Details about the extent of the MGM breach were not immediately disclosed, including the kind of information that may have been compromised and how much it cost the company.
Experts said the attacks exposed critical cybersecurity weaknesses at MGM and Caesars and shattered an image of casino invulnerability.
“At this point, all casinos should be moving to the highest defensive posture possible and taking active measures to verify the integrity of their systems and environment, and reviewing — if not activating — their incident response processes,” said Christopher Budd, a director of threat research at cybersecurity firm Sophos X-Ops.
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