9 Biggest Data Breaches by hackers in the world history

Court Ventures, a brokerage agency, was hacked in 2011 by a Vietnamese hacker group. Around 200 million user records, including sensitive personal and stock details, were stolen. The impact was so severe that the company later sold its business to Experian.

In 2015, a poorly secured U.S. voter database was exposed, leaking data of approximately 191 million citizens. The database owner was initially unknown, and federal authorities investigated the massive security lapse.

In 2014, hackers accessed eBay’s database using employee credentials, compromising around 145 million users’ data including email IDs, usernames, and addresses. The company required users to reset their passwords following the breach.

Heartland, a major U.S. payment processor, suffered a massive breach in 2009 affecting 113 million users. Hackers infiltrated its encrypted systems and stole credit card information, leading to over $110 million in settlements.

In 2007, hackers breached a TJ Maxx store Wi-Fi network in Minnesota, stealing debit and credit card data from approximately 94 million transactions. Small unauthorized charges across many cards reportedly amounted to millions of dollars.

In 2009, a former AOL employee stole over 92 million screen names and email addresses, later selling them to spammers. The breach led to billions of unsolicited emails and significant disruption to email services.

In 2015, Anthem, one of the largest health care providers in the U.S., suffered a breach affecting 80 million members. Hackers accessed highly sensitive personal and financial information, prompting costly security upgrades.

In 2009, unencrypted data containing Social Security numbers of military veterans dating back to 1972 was mistakenly sent for recycling, exposing approximately 75 million records in one of the largest U.S. military data breaches.

In 2014, hackers infiltrated JPMorgan Chase over the course of a month, compromising data of 76 million users including addresses, emails, and phone numbers. Although no major financial losses were reported, the bank suffered reputational damage.