
However, the pharmaceuticals giant only learnt of the security breach in July.
Pfizer was keen to play down the severity of the security lapse. The company said in a statement that so far there have been no reported incidents of misuse of the stolen information.
This is the third breach of Pfizer staff data in the space of a year. In July, two company laptops containing sensitive employee details were snatched from an employee’s car.
In a further incident, the company revealed that it may have lost the details of thousands of workers through peer-to-peer software earlier in the year.
Pfizer has now informed staff of the latest incident and reported it to the police.