
Columbia University Data Breach
NOTICE: If you received a NOTICE OF DATA BREACH letter from Columbia University, contact the Arnold Law Firm at (916) 777-7777 to discuss your legal options, or submit a confidential Case Evaluation form here. On August 7, 2025, Columbia University (“Columbia”) disclosed a significant cybersecurity incident (the “Data Breach”) in breach notification filings with Attorneys General’s Offices in Maine and California. The breach was first detected on June 24, 2025, after a technical outage disrupted various university systems. The investigation determined that, on or about May 16, 2025, an unauthorized actor accessed Columbia’s network and exfiltrated files. The Data Breach affected approximately 868,969 individuals, including current students, former students, applicants, and some employees. Recently, Columbia has begun notifying affected individuals,


