Columbia University says hacker stole SSNs and other data of nearly 900,000 A cyberattack in June on Columbia University allowed hackers to access the sensitive personal information of more than 860,000 people. The university filed breach notification documents with regulators in Maine and California, warning that the incident exposed Social Security numbers and any information submitted as part of college applications or collected while in attendance at the school. Contact details, demographic information, academic history, financial aid information, health insurance information and more were accessed by the hackers. Columbia said 868,969 people were affected. The incident was discovered on June 24 when the university had a tech outage that disrupted significant parts of its IT systems.…