Annapolis, Md., officials spotted malware on parking garage servers that may have compromised customer payment information.

On June 11, SP­+ Municipal Services, the company that owns the servers, launched an investigation after suspicious activity was detected on servers that handle payments for the Noah Hillman, Gott's Court and Knighton Garages, according to the Capital Gazette.

The malware was capable of accessing card numbers, names, expiration dates and CVV numbers, officials said they don't know how many have been affected by the breach but believe it may have impacted anyone using the facilities between Dec. 23 and June 11, the report said.  

Officials said the breach might not have affected monthly parking or residential permit holders.

The Maryland Attorney General has been notified of the incident and SP­+ was brought in an outside security expert to conduct comprehensive investigation as well.