Nearly three-quarters (73 per cent) of people recently fraud with online banking, surveyed admitted to using the same login details for their online banking across other websites and social networks.
Trusteer, the customer protection company for online businesses, said that by reusing these credentials, people put themselves at a serious risk of fraud.
Reusing passwords was the most common mistake made by those asked but 47 per cent also admitted to using exactly the same user ID and password to login to less secure sites.
Criminals have devised various ways to get login details from less secure sites such as online email clients and social networks and then test these credentials on financial sites to commit fraud.