A hacker recently discovered personal information linked to 191 million registered voters in the U.S. in a massive database that was leaked onto the web.

No one has claimed responsibility for the leak that exposed the data to the public.

In December, researcher Chris Vickery discovered 300GB of voter data, including the names, home addresses, phone numbers, dates of birth, party affiliations, and participation in primary or general elections. According to Forbes, the myriad data dates back to 2000, but does not contain financial data or social security numbers.

In attempts to disclose the breach, reporters from CSO and DataBreaches.net suggested NationBuilder may be involved in the incident, since it sets up digital campaigns for political parties. In addition, certain markers in the database were similar to a NationBuilder-designed database.

However, a NationBuilder spokesperson told DataBreaches.net that the IP address linked to the leaked database was not one of theirs, nor was it related to any of their hosted clients.

Instead, it is possible that a non-hosted NationBuilder customer is behind the misconfiguration.

"It is possible that some of the information it contains may have come from data we make available for free to campaigns," the provider's CEO Jim Gilliam said. "From what we've seen, the voter information included is already publicly available from each state government so no new or private information was released in this database."

"We strongly believe in making voter information more accessible to political campaigns and advocacy groups, so we provide cleaned versions of that publicly accessible information to them for free. We do not provide access to anyone for non-political purposes or that would violate any state's laws. Each state has different restrictions, and we make sure that each campaign understands those restrictions before providing them with any data," he added.