Massive 16TB Corporate Data Leak Exposes Over 4 Billion Records Researchers from Cybernews uncovered one of the largest publicly exposed datasets ever—a 16TB unprotected database containing over four billion records of professional and corporate data. The leak, discovered on November 23, included detailed LinkedIn profiles, employment histories, and personal information such as full names, phone numbers, job titles, employers, education, skills, social media accounts, and even profile photos. The data, stored in an unsecured MongoDB instance, appeared to be scraped from public sources over time and across multiple regions. While the database was secured two days after its discovery, the duration of its exposure remains unknown. The incident likely stemmed from human error, a common cause of misconfigured databases lacking proper authentication. Due to its structured and up-to-date nature, the dataset poses significant risks. Cybercriminals could exploit the information for large-scale phishing campaigns, social engineering attacks, or automated malicious operations—potentially leveraging AI tools like large language models (LLMs) to craft convincing fraudulent messages. Though collecting publicly available data isn’t illegal, the failure to secure such a vast repository may have legal consequences. The origin of the data and potential accountability for the leak remain unclear.