• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
TechCybersecurity

These Were the Worst Data Breaches and Vulnerabilities of 2018

By
Danielle Abril
Down Arrow Button Icon
By
Danielle Abril
Down Arrow Button Icon
January 4, 2019, 4:10 PM ET

More than a billion of people were affected by corporate data breaches in 2018.

From the Marriott International hotel breach, which impacted half a billion customers, to the highly-profile scandal in which a political consulting gained access to Facebook users’ information, major corporations are increasingly victims of large hacks or bungling the data they store.

Daniel Markuson, blog editor at NordVPN, a virtual private network service provider based in Panama, released a review of 11 of the worst data breaches last year. No company is immune to data breaches, which is particularly concerning as corporations continue to collect more data from users.

“The scope of these attacks shows that even the biggest corporations are vulnerable and are prone to errors,” he said. “This means that it’s becoming more difficult to trust them as we never know when our data is going to end in the wrong hands.”

Here’s a look at last year’s biggest breaches and vulnerabilities ranked by the number of people impacted, as determined by NordVPN:

  1. Marriott International (500 million users)
  2. Twitter (330 million users) The company said it mistakenly stored user passwords in plain text on an internal log accessible only to employees, and that no outsiders accessed them
  3. My Fitness Pal (150 million users)
  4. Facebook (147 million users in multiple breaches)
  5. Firebase (100 million users)
  6. Quora (100 million users)
  7. MyHeritage (92 million users)
  8. Uber (57 million users)
  9. Ticket Fly, owned by Eventbrite (27 million users)
  10. Google+ (500,000 users)
  11. British Airways (380,000 users)

Update: This story was updated with more information from Twitter. The headline was also adjusted for clarity.

About the Author
By Danielle Abril
See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Leadership
  • Success
  • Tech
  • Asia
  • Europe
  • Environment
  • Fortune Crypto
  • Health
  • Retail
  • Lifestyle
  • Politics
  • Mpw
  • CEO Initiative
  • Conferences
  • Personal Finance
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map

© 2025 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.


Most Popular

placeholder alt text
C-Suite
CEO of $90 billion Waste Management hauled trash and went to 1 a.m. safety briefings—‘It’s not always just dollars and cents’
By Amanda GerutJanuary 3, 2026
18 hours ago
placeholder alt text
Success
Marriott’s CEO spoke out about DEI. The next day, he had 40,000 emails from his associates
By Ashley LutzJanuary 1, 2026
2 days ago
placeholder alt text
Future of Work
Bank of America CEO confirms Gen Z's hiring nightmare is real: He just hired 2,000 recent grads from 200,000 applications
By Ashley LutzJanuary 3, 2026
11 hours ago
placeholder alt text
Success
Melinda French Gates got her start at Microsoft because an IBM hiring manager told her to turn down its job offer—'It dumbfounded me'
By Emma BurleighDecember 31, 2025
3 days ago
placeholder alt text
C-Suite
Exiting CEO left each employee at his family-owned company a $443,000 gift—but they have to stay 5 more years to get all of it
By Nick LichtenbergDecember 30, 2025
4 days ago
placeholder alt text
Success
Red Lobster’s 36-year-old CEO led the company after bankruptcy. Now he’s plotting the 'greatest comeback in the history of the restaurant industry'
By Sydney LakeJanuary 2, 2026
2 days ago

Latest in Tech

AsiaTariffs and trade
Countries must move beyond seeing AI as a race, where one side must beat the other
By Boris Babic and Brian WongJanuary 3, 2026
50 minutes ago
Bhargava
CommentaryPasswords
You probably use the same password for 30 different websites. It’s time for a passkey. 
By Rishi BhargavaJanuary 3, 2026
11 hours ago
data center
AIData centers
Angry town halls nationwide find a new villain: the data center driving up your electricity bill while fueling job-killing AI
By Marc Levy and The Associated PressJanuary 3, 2026
11 hours ago
tesla
Big TechAutos
Elon Musk promised a ‘major rebound’ for Tesla in 2025. Instead it fell behind its biggest rival from China
By Paul Harloff, Bernard Condon and The Associated PressJanuary 3, 2026
11 hours ago
Sweden
CommentarySweden
Meet Sweden, the unicorn factory chasing America in the AI race
By Oscar TäckströmJanuary 3, 2026
14 hours ago
Man wearing a black suit with a microphone
InvestingMicrostrategy
Michael Saylor’s Strategy flirts again with the danger threshold at which his company is worth less than his Bitcoin
By Jim EdwardsJanuary 2, 2026
1 day ago