Tesco experienced a security issue.
A database of stolen usernames and passwords from other platforms had been tried out on its websites.
It issued new cards to 600,000 Clubcard account holders.
Source: https://www.bbc.com/news/technology-51710687
TPRM report: https://scoringcyber.rankiteo.com/company/-tesco
"id": "tes2327221222",
"linkid": "-tesco",
"type": "Breach",
"date": "03/2020",
"severity": "60",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"{'affected_entities': [{'customers_affected': 600000,
'industry': 'Supermarket',
'location': 'United Kingdom',
'name': 'Tesco',
'type': 'Retail'}],
'attack_vector': 'Stolen Credentials',
'description': 'A database of stolen usernames and passwords from other '
'platforms had been tried out on its websites. Tesco issued '
'new cards to 600,000 Clubcard account holders.',
'motivation': 'Unauthorized Access',
'response': {'remediation_measures': ['Issued new cards to 600,000 Clubcard '
'account holders']},
'title': 'Tesco Security Issue',
'type': 'Credential Stuffing',
'vulnerability_exploited': 'Reuse of Usernames and Passwords'}