IBM and two of its subsidiary companies were allegedly breached during the mid-2010s, which a lawsuit filed by a former cybersecurity executive accuses IBM of not disclosing and actively covering up.

The hackers allegedly breached massive IBM cloud computing infrastructure that’s widely used by many parts of the U.S. government, including the military.

IBM, AT&T network used by US federal government was breached numerous times by Chinese hackers, alleges whistleblower lawsuit