Information on 191 million American voters has been exposed on the Internet, an independent computer security researcher has found out.
Chris Vickery told Reuters on Monday that the database had been exposed because of erroneous configuration.
It includes names, addresses, birth dates, party affiliations, phone numbers and emails of voters across the country.
The Texas tech support specialist claimed that he came across the information while looking for exposed data in an effort to raise awareness about cyber security breaches.
The data, from all 50 US states as well as Washington DC, could be used to target a large number of people.
"The alarming part is that the information is so concentrated," Vickery said, adding that he was working with federal authorities to find the owner and bring the data down.
He said he did not know if anyone else had accessed the database.
Regulations on protection of American voters’ information vary from state to state.
"Privacy regulations are required so a person’s political information can be kept private and safe,” said Jeff Chester, the executive director of the Washington-based Center for Digital Democracy.
The leak was reported in the run-up to the 2016 presidential vote in the United States.