Tesco had to deactivate some customers' net accounts after their login names and passwords were shared online.
The list of more than 2,000 Tesco.com accounts was posted to a popular text-sharing site.
After knowing about the incident, Tesco immediately investigated the incident and notified all customers who were affected.
Source: https://www.bbc.com/news/technology-26171130
"id": "TES122441222",
"linkid": "-tesco",
"type": "Data Leak",
"date": "02/2014",
"severity": "50",
"impact": "2",
"explanation": "Attack limited on finance or reputation"