Because of a website security snafu, the online real estate platform Redfin made random users’ names, email addresses, and phone numbers available to others who log onto listings. The vulnerability lasted less than a week, the company said.

The personal identification information became visible to other users who were viewing real estate listings. The information would appear momentarily when a contact information form popped up on a listing; the form would be pre-filled with details from past users, which would quickly vanish.

The contact information of past users, however, would remain visible when viewing the listing while disabling JavaScript, a programming language used to make interactive websites that can, in........

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