Despite a rise in credit card fraud, the most commonly-used PIN is still 1234, with 1111 and 0000 coming in second and third.
Research has revealed that one in ten codes is so obvious it would take criminals just one attempt to guess it correctly, while more than a quarter of the codes are used so often they can be guessed in fewer than 20 attempts.
The study from DataGenetics analysed 3.4 million four-digit codes and found that many people use birth years as PINs, making it even easier for hackers to guess a code simply by finding out a person's age from online accounts.
Research from security experts McAfee has found that 17 per cent of people in Europe have been victims of credit card fraud, at a cost of £1,076 per person.
Last year the total cost of credit card fraud in the UK from criminals hacking and cloning cards was £42.1 million and the total amount of fraud committed through all credit card-related crimes was £388 million.
There are 10,000 possible combinations for four-digit PIN codes using 0 to 9.
DataGenetics used data from previously released password tables and security breaches.
By combining the password databases, researchers filtered the results to show just four-digit numbers and were able to analyse 3.4 million four-digit passwords.
They discovered that all of the possible 10,000 combinations - from 0000 to 9999 - were found in the data list.
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