The French president's bank account has been hacked, with thieves stealing cash from the account.
Reports say cybercriminals have stolen "small sums" of money from Nicolas Sarkozy's personal bank account.
Fraudsters are said to have gained access to Sarkozy's online passwords. Luc Chatel, French secretary of state for consumer affairs, has confirmed that an investigation is underway.
Chatel also said more needed to be done to tighten the security of internet banking in France.
The French president is the latest political figure to fall victim to hackers. Last month, it was reported that US vice-presidential candidate Sarah Palin's personal e-mail account had been compromised. A man has been charged for that incident.
Graham Cluley, senior technology consultant at Sophos, said, "This latest incident highlights the fact that no one is safe and that everyone should take the necessary precautions to avoid ending up in the same boat as Sarkozy and so many others."
The French President is said to have reported the theft last month, but no one has yet been charged with the crime.
Sophos says that online banking fraud is rising rapidly in both France and the UK.