Just days before the deadline to register and vote, Pennsylvania has shut down its registration Web site because a design flaw left vulnerable personal information of people who had used it.

Department of State spokeswoman Rebecca Halton said the State Department learned of the glitch on Tuesday and shut down the site. Monday is the deadline to register. The site remained down this morning.

“The department learned information submitted by some users through the SURE system may have been viewed by other online users,” Halton said.

Most information — name, address, age and party — on the site are public. But some applicants also may have typed drivers’ license numbers or partial Social Security numbers onto the online registration form, and that information could have been viewed.