The answer is simple. Due to an employee's error.


When sending an e-mail, the employee included the data of 300 payers. The email was sent to the vice president of the trade union. What was found out? ZUS spokesman Paweł Żebrowski in an interview with praw.pl informed the Personal Data Protection Office and the prosecutor's office about the leak, and all payers will also receive information about the event.


The email sent included, among others:

• PESEL numbers
  
• ID cards
  
• dates
  
• place of birth
  
  Additionally, the employee will face professional consequences.
  
  
  Source: cyberdefence24.pl