Illustration by Alex Castro / The Verge

Facebook’s Messenger Kids app is built around a simple premise: children shouldn’t be able to talk to users who haven’t been approved by their parents. But a design flaw allowed users to sidestep that protection through the group chat system, allowing children to enter group chats with unapproved strangers.

For the past week, Facebook has been quietly closing down those group chats and alerting users, but has not made any public statements disclosing the issue. The alert, which was obtained by The Verge, reads as follows:

Hi [PARENT],
We found a technical error that allowed [CHILD]’s friend [FRIEND] to create a group chat with [CHILD] and one or more of [FRIEND]’s parent-approved friends. We want you to know that we’ve turned off this…

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Facebook design flaw let thousands of kids join chats with unauthorized users
Source: New feed