Glassdoor

Glassdoor sent the email with the addresses of more than 2 percent of its members, or over 600,000 people, clearly visible to other recipients.

Each address was made available to at least 999 other members, given that the emails were sent to multiple sets of users 1,000 at a time.

One of Glassdoor member Melissa Levine raised complain about this they did not keep their information private.

Source: https://www.databreaches.net/glassdoor-carelessly-exposed-600k-users-emails-suit-says/

TPRM report: https://scoringcyber.rankiteo.com/company/glassdoor

"id": "gla1503622",
"linkid": "glassdoor",
"type": "Data Leak",
"date": "08/2016",
"severity": "60",
"impact": "4",
"explanation": "Attack with significant impact with customers data leaks"

{'affected_entities': [{'customers_affected': 600000,
                        'industry': 'Technology',
                        'name': 'Glassdoor',
                        'type': 'Company'}],
 'attack_vector': 'Email Exposure',
 'data_breach': {'number_of_records_exposed': 600000,
                 'personally_identifiable_information': 'Email Addresses',
                 'type_of_data_compromised': 'Email Addresses'},
 'description': 'Glassdoor sent an email with the addresses of more than 2 '
                'percent of its members, or over 600,000 people, clearly '
                'visible to other recipients. Each address was made available '
                'to at least 999 other members, given that the emails were '
                'sent to multiple sets of users 1,000 at a time. One of '
                'Glassdoor member Melissa Levine raised a complaint about this '
                'they did not keep their information private.',
 'impact': {'customer_complaints': ['Melissa Levine'],
            'data_compromised': 'Email Addresses'},
 'title': 'Glassdoor Email Data Breach',
 'type': 'Data Breach',
 'vulnerability_exploited': 'Email Privacy Misconfigurations'}