Bernie Sanders' campaign has been disciplined by the Democratic National Committee after at least one staffer took advantage of a software glitch that allowed a review of Hillary Clinton's private campaign data.

The New York Times  called the suspension of access to the voter database a "major blow" to the senator's campaign.

"The database includes information from voters across the nation and is used by campaigns to set strategy, especially in the early voting states," The Times said.

The technology company NGP VAN suffered the software glitch, which exposed voter data from Clinton's campaign to others, the report said.

One person has been fired from the Sanders campaign, but there may have been four accounts associated with Sanders' campaign that ran searches on the Clinton data.

NGP VAN's chief executive Stu Trevelyan called it an "isolated incident" and said a full audit will be conducted in response to the breach, according to the Washington Post.

The Democratic National Committee is being blamed for the incident as well for enlisting what Sanders' campaign manager, Jeff Weaver, called an "incompetent vendor."

A Democratic debate is scheduled for Saturday.